Yoshin Misumai, the perennial introvert, is now dating one of the most beautiful girls in school—Nanami Barato, the clean-cut gyaru who confessed to him on a dare. With a surprise stamp of approval from Nanami's parents, the two are on their way to super flirty, ooey-gooey romance. But in the midst of a boba date and an accidental kiss, the two run into Yoshin's parents, and Nanami learns that he'll be home alone while his mom and dad are out. It's time to amp up the mood with late-night meals and an impromptu sleepover. This introvert had better prepare himself because things are getting cushy—fast!