Мика Ногидзака

Харуки's 14-year-old younger sister is passionate about the violin, squash, and caring for wild hedgehogs. She enjoys spying on her older sister and Yuto, and is more knowledgeable about love and relationships with the opposite sex compared to her sister. She likes to tease and joke with Haruki and Yuto about their relationship. Yuto is someone she is genuinely attracted to, and her flirtations with him have real underlying intentions.