One rainy day, on her way back home from work, Kanade slips and loses consciousness. When she wakes up, Tatsumi, her ex-boyfriend who also happens to be her childhood friend, appears before her. Apparently, Tatsumi's been put in charge of caring for Kanade while she recovers, and now they're suddenly living together ― talk about awkward! But, Tatsumi seems unbothered as he spends time with Kanade, and he even seems to be comfortable getting touchy-feely with her, as if they were dating! Didn't they break up...? As Kanade's acting timidly, unsure of her own feelings and feeling regret over their breakup, Tatsumi suggests that they get more intimate...!