Binan Koukou Chikyuu Bouei-bu Happy Kiss!

Kyoutarou Shuzenji, Ryouma Kirishima, Nanao Wakura, Taishi Manza, and Ichiro Dogou belong to Binan High School's Earth Defense Club, a club famous mostly for drinking tea and accomplishing nothing. Their routine changes at Kurotama Bath when a strangely dressed boy named Karls appears and drags them into a succession dispute from the magical kingdom of Honyala Land.

The five are given powers and expected to spread happiness as magical defenders, despite having no idea why they should be responsible for any of this. Their new duty soon brings them against another group empowered by a rival prince. Between transformation battles and their usual pointless conversations, the boys discover that protecting Earth can be almost as troublesome as attending club activities.