Chitose Is in the Ramune Bottle, Vol. 4 (manga)

Kenta Yamazaki sets out to face the otaku group at the source of his trauma, but he doesn’t expect to be met with a torrent of verbal abuse. No need to worry, however—the king, Saku Chitose, has got his back. With the help of his quick wit and charm, Kenta feels he can finally shut the book on his old life. Things are far from over for Saku, though, as Yuzuki approaches him with a shocking request.