Fudou Aikawa and Desumi Magahara, who have recently become a couple, have vowed to keep their relationship a secret. Fudou, also known as "Red Gelato," leads Gelato 5, a brave team dedicated to protecting Japan. Desumi, on the other hand, commands one of the combat factions of "Gekko," a sinister secret society determined to achieve world domination, and is Gelato 5's main adversary. Despite their feigned animosity towards each other, Fudou and Desumi cleverly evade combat to spend romantic moments together as they navigate their inexperience in love. Though fraught with difficulties, they are determined to nurture their relationship while concealing it from their colleagues. Juggling their love and loyalty to their respective sides, they must stay alert and keep their romance hidden from the world.