- Mitsuki Koga is the quiet music-loving classmate at the heart of The Guy She Was Interested in Wasn't a Guy at All.
- Dual identity: her androgynous record-store persona causes Aya's central misunderstanding.
- Music fluency: deep knowledge of alternative and rock music defines her self-expression.
- Relationship role: she forms the main romantic pairing with Aya Osawa.
- Anime note: an anime adaptation is scheduled to premiere on Crunchyroll in 2027.
Who Is Mitsuki Koga?
Mitsuki Koga is one of the two leads of The Guy She Was Interested in Wasn't a Guy at All, the yuri manga by Sumiko Arai serialized through KADOKAWA and published in English by Yen Press. On the surface, she is a reserved high-school student who keeps a low profile in class. Outside school, she works at a record store, where her stylish black-clad look and easy command of rock music create a completely different impression — the "cool guy" Aya falls for before learning the truth.
The series' official anime site describes the core relationship between Aya Osawa and Mitsuki Koga as its emotional center, and the franchise has surpassed 2.25 million copies sold with over 2 million social followers.
Video Highlights:
- Official anime teaser featuring the Aya–Mitsuki dynamic
- First animated glimpse of the record-store atmosphere
- Confirms a 2027 broadcast window
Start with Yen Press Volume 1 to experience Mitsuki's introduction in its intended order before reading chapter summaries online.
Mitsuki's Character Profile at a Glance
| Attribute | Detail |
|---|---|
| Full name | Mitsuki Koga (古賀美月) |
| Role | Female lead, Aya's classmate |
| Personality | Reserved, cool, observant |
| Appearance | Androgynous style; black-clad record-store look |
| School identity | Quiet student, low social profile |
| Music preference | Alternative and rock; deep record-store knowledge |
| Narrative function | Source of the central identity misunderstanding |
Mitsuki's androgynous shop persona is not a gimmick — it reflects the series' broader themes of self-presentation, first impressions, and how people express themselves differently across spaces.
The record-store persona
Mitsuki's confident, stylish presence behind the counter is the "cool boy" Aya becomes fascinated with, built from fashion and music authority rather than words.
The everyday classmate
At school, Mitsuki blends in as a quiet girl, giving Aya no reason to connect the two versions of her.
Music as her language
More comfortable expressing herself through records and playlists than small talk, Mitsuki lets shared taste do the emotional work.
Gradual closeness
Across school life and music-focused encounters, the gap between her two identities narrows as Aya and Mitsuki grow closer.
Mitsuki, Aya, and the Music That Connects Them
Music is the bridge between the two leads. Aya is drawn to the atmosphere surrounding the record store, while Mitsuki's fluency in that world reveals her private side. Their contrasting approaches are what make the pairing distinctive within yuri romance.
Aya Osawa
- Outgoing, gyaru-inspired energy
- Fascinated by the stylish clerk
- Enters music through curiosity and attraction
Mitsuki Koga
- Reserved and understated cool
- Record-store employee and music expert
- Expresses herself through listening, not talking
Their Dynamic
- Contrast drives the romance
- Enthusiasm meets quiet reserve
- Music is their shared language
| Element | Role in the Story |
|---|---|
| Record store | The meeting point where Aya first encounters Mitsuki's shop persona |
| Rock records | Establish the rebellious, stylish mood of the series |
| Headphones and listening | Intimate scenes of shared taste between the leads |
| Album artwork | Reinforces the fashion-forward visual identity |
| Author's music inspiration | Sumiko Arai's interview confirms music as core creative influence |
The official English edition is available through Yen Press and authorized digital storefronts such as BOOK☆WALKER.
Reading Order for Mitsuki's Story
| Sequence | Volume | What It Covers |
|---|---|---|
| 1 | Vol. 1 (English edition) | Aya and Mitsuki meet; the record-store misunderstanding begins |
| 2 | Vol. 2 (English edition) | The relationship deepens; more music and school-life moments |
| 3 | Series listing | Follow the Yen Press series page for new volumes |
New Reader Checklist:
- Read Volume 1 before any chapter summaries
- Pay attention to Mitsuki's two visual styles
- Track the music references in each volume
- Follow the official anime site for 2027 news
Community wikis and r/TheGuyShesInterested discussions often reveal later relationship developments. Read the published volumes first if you want to experience the identity reveal naturally.
Awards and the 2027 Anime
The manga won the Web Manga category at the 2023 Next Manga Awards, a major factor in its breakout popularity. The anime adaptation is confirmed for a 2027 premiere on Crunchyroll, based on the official teaser and the official anime site.
| Recognition | Details |
|---|---|
| Next Manga Awards 2023 | Winner, Web Manga category |
| Global sales | Over 2.25 million copies |
| Social reach | Over 2 million followers |
| Anime premiere | 2027, streaming on Crunchyroll |
| Original author | Sumiko Arai (@agu_knzm) |
Follow the author's official account at @agu_knzm and the official anime site for cast announcements and new trailers ahead of the 2027 broadcast.
FAQ
Q: Who is Mitsuki Koga in The Guy She Was Interested in Wasn't a Guy at All?
Mitsuki Koga is the quiet female lead and Aya's classmate. Working at a record store with an androgynous, stylish look, she becomes the person Aya mistakenly believes is a boy, creating the series' central misunderstanding.
Q: Why does Aya think Mitsuki is a guy?
Mitsuki's androgynous fashion and confident shop persona at the record store differ sharply from her everyday school appearance. Aya meets the store version first and forms her impression from that encounter.
Q: What role does music play in Mitsuki's character?
Music is Mitsuki's primary means of self-expression. Her knowledge of alternative and rock records defines her record-store persona and gives her and Aya a shared language before they truly know each other.
Q: When does the anime premiere?
The official teaser and anime site indicate a 2027 premiere, with Crunchyroll listed as the streaming platform. Exact broadcast dates have not yet been announced.