Ritsuko Mukae (迎 律子 Mukae Ritsuko) is one of the main characters of the Kids on the Slope series. She is a first-year student at Higashi High School and a classmate of Kaoru Nishimi and Sentarou Kawabuchi.
Ritsuko is a teenage girl with straight, shoulder length dark brown hair that she wears in pigtails with yellow ribbons tied to it, sharp and pointy bangs that stops above her eyebrows, brown eyes and freckles that goes across her nose. At the end of the anime and manga, Ritsuko cuts her pigtails off.
Ritsuko is a kindhearted, caring, cheerful and responsible girl.
Ritsuko is the daughter of Tsutomu Mukae (the owner of a record shop) and the childhood friend of Sentarou Kawabuchi. She is a also representative of class, to which Kaoru Nishimi and Sentarou are belong to. Like Sentarou, Ritsuko is a Roman Catholic and attends church together with him.
At the end of the manga, Ritsuko becomes Kaoru's wife (which makes her Ritsuko Nishimi) & she eventually becomes pregnant with his child.
- The name Ritsuko means "law" (律) (ritsu) and "child" (子) (ko).
- Ritsuko's surname Mukae means "welcome" (迎).
- In Episode 3, Kaoru Nishimi sees Ritsuko as an attractive girl.