Kaguya-sama: Love Is War, Vol. 12 (Viz Media)

Two high school geniuses scheme to get the other to confess their love first. Two geniuses. Two brains. Two hearts. One battle. Who will confess their love first...$108! Will Miyuki ever admit to his insignificant but seemingly infinite lack of nonacademic talents$109 And what of the other student council members$110 Are any of them willing to see themselves objectively$111 Then it's time for the school culture festival, which harkens back to a legend of ancient personal sacrifice that inspires the present-day students...symbolically, at least.

Plus, a student council arm wrestling competition, balloon animals and a flashback episode to Miyuki's first awkward weeks as an outsider at Shuchiin High. Cosplay makes the woman.