Fudou Aikawa fights monsters as Red Gelato, leader of the sentai team Gelato 5; Desumi Magahara cuts down their allies as the Reaper Princess, a top general of the evil Secret Society Gekko. Fudou falls for Desumi at first sight, confesses on the battlefield, and the two start dating in secret. Now they have to hide the relationship from Gelato 5's color-coded teammates and Professor Big Gelato on one side and from Gekko's leadership on the other, while still maiming each other convincingly every time their factions clash.