Natsumi met Haruto at a drinking party and somehow ended up lending her shoulder for him to sleep on. Ever since that night, Haruto comes over to her house at 10:00 PM on Wednesday with the aim of sleeping on Natsumi's shoulders.

Natsumi is timid when it comes to romance. Although she is attracted to Haruto, she vows to her heart that she will never like men who don't know what she is thinking. Thus, a mysterious relationship between the clumsy two begins.