All his life, Manamichi has only known how to study. But summer break, he's tasked with delivering homework to his classmate, Makura Koiro. He soon discovers that she spends all day in her pajamas, and that's when she makes him a proposal:

"Hey... wanna slack off together?"

With her guard down and clad in her cute PJs, the two spend their days playing games and sharing meals. Before they know it, they even end up in the same bed...?!