While messing around with each other in junior high school, Choco groped his best friend Bun's chest. From then on, Bun has been harbouring impure feelings for Choco. But the naive Choco straightforwardly declared: "Bun-chan, I like you!"

Bun knows perfectly well that he meant it in a platonic way. Still, he can't help feeling depressed. To save their friendship, Bun tries his best to hide his true feelings from Choco.