Futaba Yoshioka thought all boys were loud and obnoxious until she met Kou Tanaka in junior high. But as soon as she realized she really liked him, he had already moved away because of family issues. Now, in high school, Kou has reappeared, but is he still the same boy she fell in love with?

Futaba Yoshioka has encountered her first love again in high school, but he seems different from the boy she once knew. Futaba starts dating Toma, and they kiss. Now what will happen when everyone is grouped together on a class trip to Nagasaki?