Fly Me to the Moon, Vol. 26

Asimo has thrown down the gauntlet: if he can score at the top of the nation in his college entrance exams, he'll ask out his crush, the irrepressible tease Himari. Unfortunately for him, Nasa has decided to take the exams too, despite not being in high school or planning to attend college. Tsukasa has to convince Nasa to back away from the whole situation, and not because Himari keeps coming on to her husband. Well, not just because of that.

Volume 26 of the Fly Me to the Moon manga series by Kenjiro Hata.