On December 21st, Koji Miura, the author of the manga 'Blue Box', reported on X that he had appeared at Jump Festa 2026 in a "Chinatsu-senpai" costume, sparking many voices of astonishment.
'Blue Box' is a comic series currently serialized in "Weekly Shonen Jump" (Shueisha), which delicately depicts the earnest dedication of life-sized characters pouring their hearts into club activities, and the subtle emotional shifts "when one falls in love with someone." The TV anime version was broadcast in two consecutive cours starting in October 2024, and a second season has also been confirmed for production.
![[Photos/Images] "Sensei is really going all out!" Unexpected person was the "inside person" of the costume at 'Blue Box' stage event 1st](https://times-abema.ismcdn.jp/mwimgs/c/7/724w/img_c7226d181f5fef809a10713c5c01920c86875.jpg)
