The Boy and I Who Will Break Up in 100 Days (2026) official poster — Japanese BL starring Kentaro Ito and Kanichiro

The Boy and I Who Will Break Up in 100 Days

CompletedTV Series🇯🇵

SYNOPSIS

The Boy and I Who Will Break Up in 100 Days (Japanese: 100日後に別れる僕と彼; Hepburn: Hyakunichigo ni Wakareru Boku to Kare) is a 2026 Japanese boys' love drama about a couple who have to keep being a couple after they have stopped being one. Yuma Kasuga (Kentaro Ito) and Itsuki Hasegawa (Kanichiro) went viral almost by accident: an interview about their local government's partnership oath system caught the internet's attention, and overnight the two of them became the country's image of an ideal same-sex couple, photogenic, articulate, reassuringly ordinary. Yuma, who believes that visibility can do real good, agrees to let a documentary crew film a hundred days of their life together. By the time the cameras arrive, he and Itsuki have already broken up.

Neither of them says so. The film is directed by Shiho Kayano (Yui Narumi), who has no idea that the domestic warmth she is capturing is a performance rehearsed each morning before she rings the bell. Across episodes with titles like "The Falsehood of 'Playing Lovers'" and "Searching for the Real 'You,'" the gap widens between what the lens records and what the two men actually feel. Yuma throws himself into being the perfect partner, because being perfect is the point of the project and, increasingly, the only role he still knows how to play. Itsuki suffocates under that ideal, the version of him on screen is someone he was never asked whether he wanted to be. Around them, figures like Isao Hinode (Naoto Takenaka) press on the couple's carefully maintained surface, and the countdown keeps running.

The series is adapted from the novel by Asahara Naoto, an author whose fiction about queer life in Japan drew wide acclaim before his death, and it keeps his interest in the distance between being accepted and being understood. Shogo Kusano directs from a script by Naoyuki Miura, with C&I Entertainment, the production company behind Drive My Car, giving the six episodes an unhurried, observational texture closer to film than to television romance. It premiered on 26 May 2026 in MBS's late-night Dramaism slot, streaming on FOD Premium in Japan and on GagaOOLala internationally. Its sharpest idea is structural: a story about representation told through a documentary that is quietly lying, asking what a hundred days of pretending finally counts down to.

CONTENT DETAILS

Native Title
100日後に別れる僕と彼
Original Title
The Boy and I Who Will Break Up in 100 Days
Also Known As
100日後に別れる僕と彼, Hyakunichigo ni Wakareru Boku to Kare, 100 Days Until We Break Up
Adaptation
Adapted from the Japanese novel "100日後に別れる僕と彼" (Hyakunichigo ni Wakareru Boku to Kare) by Asahara Naoto (浅原ナオト), published by KADOKAWA.
Themes
Key Themes
Fake RelationshipBreakupLGBTQ+ VisibilityPublic vs PrivateDocumentaryHonestyIdealized LoveCommunicationSocial MediaAcceptanceVulnerabilitySelf-DiscoveryGrief
Country
Language
Japanese
Director
Shogo Kusano
Screenwriter
Naoyuki Miura
Original Author
Naoto Asahara
Networks
Seasons
1
Episodes
6
Duration
24 min
Aired Start
Aired End
Release Year
Production Co

WATCH ON

GagaOOLala

MAIN CAST & CHARACTERS

KEY TAKEAWAYS

  • Series overview: The Boy and I Who Will Break Up in 100 Days (100日後に別れる僕と彼) is a 2026 Japanese BL drama, 6 episodes airing from May 26 to June 30, 2026 in MBS’s Dramaism slot.
  • Based on an acclaimed novel: adapted from the work of the late LGBTQ+ author Asahara Naoto, who passed away in 2023, giving the story unusual emotional weight.
  • A fake-relationship premise with a twist: a viral “ideal” gay couple who have already broken up keep faking their love for a 100-day documentary.
  • The leads: Kentaro Ito as Yuma Kasuga and Kanichiro as Itsuki Hasegawa.
  • The director character: the unsuspecting documentary director Shiho Kayano is played by Yui Narumi, unaware her subjects are performing rather than living their real relationship.
  • Serious themes: LGBTQ+ visibility, the gap between public image and private truth, and whether pretending can become real.
  • Crew: directed by Shogo Kusano and written by Naoyuki Miura, produced by C&I entertainment, the company behind the film Drive My Car.
  • Origin: the source novel began as a serialized story on Kadokawa’s Kakuyomu web-novel platform before its print publication.
  • Where to watch: streaming exclusively in Japan on FOD Premium, and internationally on GagaOOLala with subtitles.
  • Rating status: no platform has published an official age rating for the series as of this writing.

EDITOR’S VERDICT

7.5/10

The Boy and I Who Will Break Up in 100 Days is one of 2026's more thoughtful Japanese BLs, carrying real weight thanks to its source: a novel by the late LGBTQ+ author Asahara Naoto. Its premise, a viral "perfect" gay couple who have secretly broken up but keep faking it for a documentary, is almost cruel in its honesty.

The Leads

Kentaro Ito’s Yuma clings to the image of the ideal partner, while Kanichiro’s Itsuki chafes against it; the tension between public visibility and private messiness is the heart of the show.

Yui Narumi's oblivious documentary director adds an extra layer of dramatic irony, since every scene she captures is staged for her benefit alone.

What to Expect

  • Emotionally weighty: grief, honesty and LGBTQ+ visibility over light romance.
  • Strong source: a faithful-minded adaptation of an acclaimed novel.
  • Quiet, mature tone: a character study more than a fluffy love story.

The Verdict

A mature, affecting Japanese BL with something real to say; The Boy and I Who Will Break Up in 100 Days is well worth it for viewers who want substance and emotional honesty.

Final Score: 7.5/10

OFFICIAL TRAILER

OFFICIAL OST

EPISODE SCHEDULE

6 / 6 episodes aired · Completed
EP 1
26 May 2026
Aired
EP 2
02 Jun 2026
Aired
EP 3
09 Jun 2026
Aired
EP 4
16 Jun 2026
Aired
EP 5
23 Jun 2026
Aired
EP 6
30 Jun 2026
Aired

FREQUENTLY ASKED QUESTIONS

What is The Boy and I Who Will Break Up in 100 Days (2026) about?

It is a 2026 Japanese BL about Yuma Kasuga and Itsuki Hasegawa, a gay couple seen online as "ideal" who agree to film a 100-day documentary about their life together to promote LGBTQ+ understanding. The catch is that they have already broken up, and must fake being in love for the cameras while their real feelings and their lies intertwine.

Is it based on a novel?

Yes. It is adapted from the novel "100日後に別れる僕と彼" (Hyakunichigo ni Wakareru Boku to Kare) by the late LGBTQ+ author Asahara Naoto.

How many episodes is it and where did it air?

It has 6 episodes, averaging roughly 24 minutes each, and premiered on May 26, 2026 in MBS's late-night Dramaism slot in Japan, running weekly through June 30, 2026.

Who stars in it?

Kentaro Ito stars as Yuma Kasuga and Kanichiro stars as Itsuki Hasegawa, the two leads whose fake relationship drives the story.

Where can I watch it with English subtitles?

It streams internationally on GagaOOLala with subtitles. In Japan, all six episodes are exclusive to the FOD Premium subscription service.

Who created the series?

It was directed by Shogo Kusano, written by Naoyuki Miura, and produced by C&I entertainment, the company behind the acclaimed film Drive My Car.

Is it a BL drama?

Yes. It is a boys' love (BL) drama centered on the relationship between Yuma and Itsuki, and on the wider theme of how a same-sex couple is perceived by the public.

Who plays the documentary director in the series?

The unsuspecting documentary director, Shiho Kayano, is played by Yui Narumi. She has no idea that the couple she is filming has already broken up.

What made Yuma and Itsuki go viral?

They gained attention online after an interview about a local government partnership oath system for same-sex couples, which the public embraced as heartwarming, turning them into a symbol of an "ideal" gay relationship.

Why do Yuma and Itsuki keep pretending to be together?

Yuma hopes the documentary will help broaden public understanding of LGBTQ+ relationships, so once he and Itsuki have quietly broken up, he persuades Itsuki to keep performing as a couple rather than cancel the project.

What themes does the series explore?

The show explores LGBTQ+ visibility, the gap between public image and private truth, everyday pressures facing sexual minorities, and whether a relationship performed for cameras can become real again.

How long is each episode?

Episodes run close to 24 minutes on average, with the premiere running slightly longer at around 25 minutes, giving the season a compact runtime of roughly two and a half hours in total.

Does the novelist appear connected to the show beyond the source material?

The novel's author, Asahara Naoto, passed away in July 2023, so the drama was produced without the author's direct involvement, released as a tribute adaptation of the acclaimed source novel.

Where did the source novel originate?

It began as a serialized story on Kadokawa's Kakuyomu web-novel platform before being published in print by KADOKAWA, later expanding into the wider readership that led to this TV adaptation.

Is there an official content rating for the series?

No platform, including GagaOOLala, and no drama database has published an official age rating for this title as of this writing.

What network aired The Boy and I Who Will Break Up in 100 Days in Japan?

It aired on MBS as part of the "Dramaism" late-night drama block, with the broadcast airing Tuesdays; VOD distribution in Japan was handled separately through FOD Premium.

Is this drama a fake-relationship story?

Yes, with a twist: rather than a couple faking a relationship to start one, Yuma and Itsuki fake a relationship to hide that a real one has already ended, adding emotional weight to the trope.

Who are the supporting cast members?

The cast also includes Kento Yamada, Masumi Nomura, Kaoru Mitsumune, Asuka Kudo, veteran actor Naoto Takenaka, Tatsumi Asa, and Masahiro Toda, who plays Yuma's father.

Does the series have a trailer or soundtrack listed on this page?

Yes, both are now confirmed. Broadcaster MBS (毎日放送) posted the official 60-second Dramaism trailer, cut to the ending theme, on its own YouTube channel: https://www.youtube.com/watch?v=185cF6iXS4s. That ending theme is "僕は" (Boku wa) by Japanese singer-songwriter tonun, released as a single on 27 May 2026 through Universal Music: https://open.spotify.com/album/2UkvkDP2tm0TVm9PFnueU3

How does the title reflect the story?

The 100 days refer to the length of the documentary shoot the couple agrees to fake their way through, with the series structured around that ticking clock toward either a final breakup or a rekindled relationship.

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