Due to her idealized expectations for the perfect guy, 16-year-old Karin Sakuma has never had a boyfriend, and even her purchasing decisions are guided by appearance over practicality. After her mother sets her up on a blind date with Takuma Morino, Karin recognizes him as a childhood friend who once proposed marriage to her. Though Takuma still harbors feelings for Karin and meets her criteria, she is taken aback by his weight and declines his marriage proposal. However, she agrees to spend more time with him to see if their relationship could progress.