Binan Koukou Chikyuu Bouei-bu Happy Kiss!

Binan City lies within Japan's northern Kanto region...

At Binan High School, as is often the case, the "Earth Defense Club" did nothing useful or productive. Members Kyoutarou Shuzenji, Ryouma Kirishima, Nanao Wakura Taishi Manza and Ichiro Dogou would casually enjoy tea together while engaging in pointless dialogue that ultimately reached nowhere.

All the students had now assembled at Kurotama Bath after school, when Ryouma pulled Kyoutarou Shuzenji out from water which felt too good, only for his towel to come with him, carrying an unknown face dressed differently from himself.

These five boys find themselves drawn into an epic struggle between three rival clans for control of Honila Land's mysterious royal estate...