MeruPuri, Vol. 4

While on a seaside field trip, the little boy Aram and Airi find themselves in the middle of a blackout at a public bath. Frazzled to no end, Airi drags Aram inside a closet, but someone walks in on them. Will Aram's secret be blown so soon? Meanwhile, Aram's former fiancée Mariabel shows up at school. What evil schemes does she have in store for Aram and Airi?