The Boy and I Who Will Break Up in 100 Days – Series Review

The Boy and I Who Will Break Up in 100 Days is a Japanese BL series about a couple who becomes the subject of a documentary. A film crew follows them around and captures footage of their relationship.

The Boy and I Who Will Break Up in 100 Days is a Japanese BL series about a couple who becomes the subject of a documentary. The main character and his boyfriend went viral for an interview about marriage equality. After their story gains attention, a film crew approaches them about documenting their everyday relationship. The protagonist sees the project as a chance to raise LGBTQ+ visibility, but his partner isn't eager to appear on camera.

I love that The Boy and I Who Will Break Up in 100 Days begins with a mockumentary format. It's such a unique way to tell the story! The series impresses me with its sharp social commentary, especially its intelligent stance on marriage equality, heteronormativity, and meaningful LGBTQ+ topics. However, some scenes sound awkward since the characters talk like they're lecturing the viewers. The couple's romance also feels too bleak.

The Boy and I Who Will Break Up in 100 Days Summary

Summary

The Boy and I Who Will Break Up in 100 Days (100日後に別れる僕と彼) is a Japanese BL series about a gay couple who becomes the subject of a documentary. A film crew follows them around and captures footage of their relationship.

Title:

100日後に別れる僕と彼

Series:

Japanese BL

Year:

2026 BL

Format:

Long Series

Length:

3 hours

Episodes:

6 episodes

Genre:

Romantic Drama

Type:

Mature & Interesting BL

Plot

Yuma and Itsuki registered for the registered for the Tokyo Partnership Oath System.

Yuma Kasuga and Itsuki Hasegawa are a gay couple in their late 20s. They've been dating for a year and a half. Last year, they registered for the Tokyo Partnership Oath System. This certificate gives same-sex couples some of the legal rights that come with marriage in certain parts of Tokyo. However, it still leaves out many rights that straight couples take for granted. Yuma and Itsuki apply for it anyway. They believe society needs to see that same-sex couples exist.

While applying for the certificate, a TV station interviewed Yuma and Itsuki. This telegenic gay couple quickly caught the internet's attention. Their interview went viral and attracted tons of supportive comments. Everyone was happy for them. After seeing the positive response, a documentary crew approached the couple with an offer. The project will follow Yuma & Itsuki over 100 days and document their everyday life. The footage will eventually become a TV documentary called 100 Days with Him and Me. It's meant to help audiences understand the experiences of an ordinary same-sex couple in Japan.

Shiho Kayano is the director. She's taking over the project from her coworker, Naomi, who has recently gone on maternity leave. Shiho and her cameraman, Yamada, begin filming the couple. Although the documentary is supposed to follow Yuma & Itsuki for "100 days", the actual schedule isn't that intense. Shiho checks in with them only a few times during that period. During each visit, she wants to focus on a different part of their life. Topics include their relationships with their loved ones and their experiences as a gay couple.

Yuma and Itsuki are filming a documentary.

Yuma is noticeably enthusiastic about the project. He sees the documentary as an excellent platform for raising awareness about LGBTQ+ issues. Yuma happily invites the film crew to his marketing agency, where they interview his coworkers. His boss, Kubota, is proud to show off the company's progressive workplace policies. Yuma also introduces the crew to his parents, who support their son's relationship. They've welcomed Itsuki into the family and include him in traditions as if he's already their son-in-law.

Yuma came out to his family when he was 20 years old. During university, he joined an LGBTQ+ club and befriended Katigiri, an upperclassman who's also a fierce lesbian activist. After graduation, Katigiri founded Marginal Women, an organization that advocates for marginalized groups. Katigiri agrees to appear in the documentary. She meets Yuma with the camera crew on their old university campus. During the visit, many LGBTQ+ students show up because they're fans of the couple. They treat Yuma and Itsuki almost like celebrities. Some of them even ask for autographs.

Compared to his partner, Itsuki is much less excited about the documentary. He's a former bartender who recently quit his job and now spends his time playing mobile games on his phone. During interviews, Itsuki gives short answers and barely smiles for the camera. Shiho privately admits that Itsuki is less cooperative than Yuma. The crew assumes Itsuki is uncomfortable being filmed and needs more time to warm up to the cameras. They don't realize that there's another reason for his lack of enthusiasm. Secretly, Itsuki doesn't want to be part of this project at all.

The Boy and I Who Will Break Up in 100 Days Trailer

The Boy and I Who Will Break Up in 100 Days Cast

Characters

Yuma

Kentaro Ito (伊藤健太郎)

Yuma's actor is portrayed by Kentaro Ito (伊藤健太郎).

Yuma Kasuga is a marketing employee. He has been dating Itsuki for a year and a half. Yuma is open about being gay and believes LGBTQ+ visibility can help change society. After his relationship goes viral, Yuma eagerly agrees to participate in a documentary about their everyday life. He introduces the cameras to his workplace, family, and activist friends.

Kentaro Ito

Kentaro Ito (伊藤健太郎) is a Japanese actor. He is born on June 30, 1997.

Kentaro Ito (伊藤健太郎) is a Japanese actor. He is born on June 30, 1997. His first BL project is the 2026 drama, The Boy and I Who Will Break Up in 100 Days.

Itsuki

Kanichiro Sato (佐藤寛一郎)

Itsuki is portrayed by Kanichiro Sato (佐藤寛一郎).

Itsuki Hasegawa is Yuma's boyfriend and a former bartender who recently quit his job. Compared to Yuma, he is much quieter and appears less comfortable being filmed. During interviews, Itsuki gives short answers. He rarely shows much enthusiasm for the documentary. Although the crew assumes he's camera-shy, Itsuki secretly wishes he had never agreed to the project.

Kanichiro Sato

Kanichiro Sato (佐藤寛一郎) is a Japanese actor. He is born on August 16, 1996.

Kanichiro Sato (佐藤寛一郎) is a Japanese actor. He's often known as just Kanichiro. He is born on August 16, 1996. His first BL project is the 2026 drama, The Boy and I Who Will Break Up in 100 Days.

Shiho

Yui Narumi (鳴海唯)

Shiho is portrayed by Yui Narumi (鳴海唯).

Shiho Kayano is the director assigned to film Yuma and Itsuki's 100-day documentary. She takes over the project after her coworker goes on maternity leave. Along with her cameraman Yamada, Shiho visits the couple periodically to capture different parts of their life. As filming continues, she notices the contrast between Yuma's eagerness and Itsuki's reluctance.

Yui Narumi

Yui Narumi (鳴海唯) is a Japanese actress. She is born on May 16, 1998.

Yui Narumi (鳴海唯) is a Japanese actress. She is born on May 16, 1998. Her first BL project is the 2022 drama, Eternal Yesterday. She appears in the 2026 series, The Boy and I Who Will Break Up in 100 Days.

Supporting Cast

Yamada is portrayed by Kento Yamada (山田健人).

Yamada

Kento Yamada (山田健人)

The president is portrayed by Naoto Takenaka (竹中直人).

President

Naoto Takenaka (竹中直人)

Naomi is portrayed by Masumi Nomura (野村麻純).

Naomi

Masumi Nomura (野村麻純)

Katigiri is portrayed by Kaoru Mitsumune (光宗薫).

Katagiri

Kaoru Mitsumune (光宗薫)

Kubota is portrayed by Asuka Kudo (工藤阿須加).

Kubota

Asuka Kudo (工藤阿須加)

Naomi's baby is portrayed by a Japanese child.

Naomi's baby

Yuma's mother is portrayed by a Japanese actress.

Yuma's mother

Yuma's father is portrayed by Masahiro Toda (戸田昌宏)

Yuma's father

Masahiro Toda (戸田昌宏)

Itsuki's fan is portrayed by a Japanese actor.

Itsuki's fan

Itsuki's boss is portrayed by a Japanese actor.

Itsuki's boss

Itsuki's coworker is portrayed by a Japanese actress.

Itsuki's coworker

Batch is Itsuki's toy.

Batch

Cast Highlights

Yui Narumi

Shiho's actress has a supporting role in the 2022 Japanese BL series, Eternal Yesterday.

Kento Yamada

Yamada's actor has a supporting role in Takara's Treasure (2024) and School Trip: Joined a Group I'm Not Close To (2025).

Masumi Nomura

The actress who plays Naomi appears in the first two episodes of the 2025 drama, Your Divorce Is Served.

The Boy and I Who Will Break Up in 100 Days Review

Review

Drama Review Score: 7.8

B
Yuma and Itsuki chat.

The Boy and I Who Will Break Up in 100 Days begins so creatively. Instead of telling the story the usual way, Episode 1 pretends we're watching a faux documentary. We see candid footage of the couple. We listen to their first-person interviews. I love how the series plays around with the mockumentary format, which feels really different from other BL series. The later episodes are also interesting because we see what happens after the cameras stop rolling. Behind the scenes, the picture-perfect relationship gets a lot messier!

Many BL dramas only focus on fanservice, but The Boy and I Who Will Break Up in 100 Days actually gives a damn about LGBTQ+ issues. I admire its intelligent stance on marriage equality, heteronormativity, microaggressions, and performative activism. On each topic, the story is well-informed and offers nuanced opinions. It also calls out the problematic side of the BL industry, especially the weirdo fans who fetishize gay men and obsess over top-bottom dynamics. The Boy and I Who Will Break Up in 100 Days is easily one of the most progressive series out there. I'm amazed by its sharp and insightful social commentary.

I share many of the same views as The Boy and I Who Will Break Up in 100 Days. On a personal level, the story's messages line up with my values. That said, the series can be exhausting. Like that one friend who's too woke, everything turns into a Very Serious Debate about social justice. Some conversations sound awkward because the characters talk like they're lecturing the viewers. Other scenes feel as joyless as attending an LGBTQ+ sensitivity seminar with mandatory training modules. The topics may be important, but the delivery isn't enjoyable.

At first, Yuma and Itsuki are the poster couple for marriage equality. So inspiring! Sadly, their relationship dies for the rest of the series. In one scene, both guys undress in the same room, yet they never even glance at each other. Hello!? You're half-naked! Where's the thirst? The story is cynical about their romance. It never gives us much hope that they'll rekindle their feelings. Part of me appreciates the realism, showing that not every couple lasts forever. But damn, we see so many of their negative moments. There's hardly any affection or intimacy between them.

Yuma's actor (Kentaro Ito) comes across as slightly awkward in some scenes, but it works in his favour. His earnest demeanour makes him seem more believable as an ordinary guy. Meanwhile, his co-star (Kanichiro Sato) plays the emotionally distant Itsuki. Even though he gives an okay performance, I could never really connect with his character. He just appears so standoffish and detached from the world around him. As for Director Shiho, I like the actress (Yui Narumi), who appears confident in her scenes. I also like the playfulness from Cameraman Yamada (Kento Yamada).

Near the end, I kinda lost interest in Yuma & Itsuki's relationship. Thankfully, the finale wins me over again. I love how both guys give private interviews to the camera, using the documentary format to reveal their deepest feelings. As I listen to their thoughtful speeches, I'm reminded of what first impressed me about this series. Compared to all the mindless BL smut, The Boy and I Who Will Break Up in 100 Days has something meaningful to say about LGBTQ+ issues. Even if a few episodes are slightly iffy, this intelligent drama still earns a respectable score from me.

Summary

Intelligent story

The faux-documentary format is such a unique way to tell the story. The sharp LGBTQ+ commentary is thoughtful and progressive, although the social-justice discussions can feel preachy.

Cynical romance

I like how the series puts a spotlight on same-sex couples, but the story focuses more on conflict and negative moments. With barely any affection, the romance is difficult to root for.

Solid acting

Kentaro Ito's awkward demeanour suits Yuma's earnest character. The supporting cast is solid too, although Kanichiro Sato's aloof portrayal makes his character harder to connect with.

Sad ending

The Boy and I Who Will Break Up in 100 Days has a sad ending, since Yuma & Itsuki's relationship doesn't survive. That said, the finale contains thoughtful messages and emotional depth.

Creative artistry

I love the mockumentary concept, which tells the story in a very different way than most BL dramas. With that said, the series isn't adventurous with its cinematography choices.

78%

The Boy and I Who Will Break Up in 100 Days earns my respect for its intelligent stance on LGBTQ+ issues. The story is packed with sharp social commentary, even if some scenes get too heavy-handed.

The Boy and I Who Will Break Up in 100 Days Episodes

Episode Guide

Yuma and Itsuki hold hands at night.

The Boy and I Who Will Break Up in 100 Days has a total of 6 episodes. Each episode is around 24minutes long. It is a medium-length BL drama, and you can finish the entire series in under 3 hours. The Boy and I Who Will Break Up in 100 Days started on May 27, 2026 and finished its last episode on July 1, 2026.

The Boy and I Who Will Break Up in 100 Days is an adaptation. The original story is a Japanese novel by Naoto Asahara (浅原ナオト).

Episode 1
Episode 2
Episode 3
Episode 4
Episode 5
Episode 6

The Boy and I Who Will Break Up in 100 Days Information

Director

Shogo Kusano (草野翔吾) is a Japanese BL drama. His BL projects include My Love Mix-Up (2021), What She Likes (2021), and The Boy and I Who Will Break Up in 100 Days (2026).

Creator

Naoto Asahara (浅原ナオト) is a Japanese writer whose novels have been converted into live-acation BL dramas. He passed away in July 2023. His BL portfolio includes the drama version of What She Likes (2019), the movie version of What She Likes (2021), and The Boy and I Who Will Break Up in 100 Days (2026).

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