My Youth Romantic Comedy Is Wrong, as I Expected manga volume 18 features story by Wataru Watari and art by Naomichi Io and Ponkan 8.

Full steam ahead toward prom! The Soubu High School Prom is at a standstill now that Yukino's mother is on the scene. Seeing how much Yukino and Iroha want to hold the event, Hachiman plans a separate prom of his own—a move that’ll inevitably lead to conflict with both girls, and will require asking for help from others. Yui has a question for Hachiman: Just what is he thinking....?