高瀬 則子

She is Shino's daughter and the protagonist's cousin.
She is a first-year student at Shirosakura Jogakuen.

Like her mother, she is a cheerful and sociable girl who always has a smile on her face.
She cheerfully encourages the introverted protagonist by pushing him along.

She does not recognize the main character as the opposite sex,
and treats the protagonist as if they were brother and sister.

Noriko is also taught piano by her mother and is quite skilled.