My Youth Romantic Comedy Is Wrong, As I Expected, Vol. 6 (light novel) — Wataru Watari

Ah, culture festivals. The best way to survive such a troublesome chore is...don't answer when someone talks to you, and act obviously annoyed. Employing his loner skills to the fullest, Hachiman is ready and willing to run at the first sign of responsibility. Unfortunately, while he's busy skipping homeroom, he ends up being chosen for the culture festival committee...