Sakurazaka46 and the long-running manga series Hunter × Hunter have joined forces for a new music video collaboration. The project pairs Sakurazaka46's track "Unhappy Birthday Koubun" with content from Yoshihiro Togashi's iconic series.

The video is the 57th entry in JUMP MV, an ongoing collaboration initiative from Weekly Shonen Jump that matches manga properties with artists from Sony Music Group. "Unhappy Birthday Koubun" originally came out as Sakurazaka46's 13th single in October 2025.

JUMP MV has become a regular way for Weekly Shonen Jump to cross-promote its series with the music industry, creating unique visual content that reaches both manga and music fans. The series behind Hunter × Hunter has maintained a dedicated following since its debut, making it a natural fit for high-profile music collaborations.