Yoshimoto Itsuki, a day trader who rarely leaves his house, decides to take a walk one day. He accidentally bumps into a student, Sumida Gen, causing him to drop his food. Moved by Gen's tears over his ruined meal, Itsuki buys him a new snack as an apology. From that day on, Itsuki can’t help but buy meals for Gen regularly.
Hoshigari sugi da yo, Sumida-kun!