Katou Ui

One of the heroines, a second-year student at a local school. A girl who is a childhood friend who lives in the house next door. She calls Fuki “big brother” and adores him.

Her name, “Ui”, has often been mistaken for “Ai” because of its unusual reading, and she has a little complex about it. She is a hard worker by nature and is good at working diligently.

Since she and Fuki, who has been with her since birth, can communicate with each other with few words, her interactions with men are based on this.

As a result, she has not mastered any of the male-female interactions necessary for romance. Since she is not naturally adept in matters of romance, she has a tendency to find it troublesome.