MeruPuri volume 3 features story and art by Matsuri Hino.

While on a seaside field trip, Aram and Airi find themselves in the middle of a blackout at the public bath. Frazzled to no end, Airi drags Aram inside a closet but fails to prevent someone from walking in on them. Will Aram's secret be blown so soon?

Meanwhile, Aram's cousin Razu confronts Airi and reveals the history behind their families. What happened in their families' past that made Razu hate Airi enough to want to make her heart stop beating? As ifRazu wasn't trouble enough, Aram's former fiancee Mariabel shows up atschool. What evil schemes does she have in store for Aram and Airi? It wouldn't have anything to do with playing with Aram's memory, would it...?