A 15-year-old girl and Hiyori's best friend. She is the first person to encourage Hiyori to become more sociable and return to school. Hiyori calls her Ri-chan. Her most notable feature is her red twintails. She is also a member of the archery club and prefers a guy who "will not die even if an arrow pierces his heart." An extra side story reveals that Ritsuka was very popular with boys in middle school and wondered what it would be like to love someone and have a boyfriend. A boy confesses to her, and she goes to the fireworks festival with him. However, he says something about Hiyori that Ritsuka finds rude, so she hits him in the face with her bag. She runs to Hiyori's house and says that right now Hiyori is the one she loves (implying it as friends) and tells Hiyori that if she ever falls in love, Hiyori will be the first to know.
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