It's All Your Fault

• Name — It's All Your Fault • Ja Kanji — 全部君のせいだ • Ja Romaji — Zenbu Kimi no Sei da • Genre — * Comedy • Slice of life • Yuri

• Type — manga • Author — Merryhachi • Publisher — Shueisha • Magazine — Ultra Jump • First — June 17, 2022 • Last — February 18, 2025 • Volumes — 5

• Portal — yes It's All Your Fault is a Japanese manga series written and illustrated by Merryhachi. It was serialized in Shueisha's seinen manga magazine Ultra Jump from June 2022 to February 2025, with its chapters collected in five tankōbon volumes. The series follows Shiho Kumai, a passionate manga and cosplay enthusiast who befriends popular cosplayer Yotogi after defending her from harassment, only to discover Yotogi's provocative "exposure cosplayer" style clashes with her own conservative views on the hobby. The series has been licensed for English release in North America by Yen Press.

Shiho Kumai, an avid manga and cosplay enthusiast, intervenes when she witnesses a woman being harassed at her university. The woman is revealed to be Yotogi, a popular cosplayer with over 200,000 followers on social media. After their encounter, the two collaborate at a cosplay event. Shiho initially believes she has found a kindred spirit, but soon discovers Yotogi is an "exposure cosplayer"—a type of performer Shiho strongly dislikes due to their revealing costumes and provocative content. The two clash over their opposing views on cosplay, with Shiho's reserved nature conflicting with Yotogi's bold, boundary-pushing approach. As their interactions continue, their relationship evolves, exploring personal boundaries, differing subcultural values, and the challenges of finding common ground despite contrasting perspectives.

Written and illustrated by Merryhachi, It's All Your Fault was serialized in Shueisha's seinen manga magazine Ultra Jump from June 17, 2022, to February 18, 2025. Shueisha collected its chapters in five tankōbon volumes, released from December 19, 2022, to March 18, 2025. In North America, the series has been licensed for English release by Yen Press.