Age: 16 Years Old
Class: 1st Year Highschool Student
Height: 165 cm (5'5")
Weight: 54 kg

Ritsuko is a classmate of Kaoru and Sentaro and an old friend of the latter. This kind, always cheerful and charmingly-freckled high school freshman is also the poster girl for Welcome Records, her family's record shop. The basement of the shop has a practice studio that serves as a hang-out for Sentaro, Kaoru, her father, and assorted jazz cronies.