Aya Arisugawa, a spirited high school classmate of Nasa Yuzaki, balances airheaded spontaneity with a carefree charm. Though openly harboring feelings for Nasa, she channels mature selflessness by wholeheartedly supporting his marriage to Tsukasa, prioritizing their happiness over her own heart.

Hailing from the Arisugawa family, stewards of a local public bathhouse, Aya contrasts her sister Kaname’s lively matchmaking antics with a more reserved demeanor. Her love for video games underscores a playful, modern youthfulness.

When Nasa assumes a teaching role at an all-girls school in *High School Days*, Aya navigates his newfound popularity among students seeking romantic advice. Through these interactions, she remains authentically cheerful and steadfast, quietly reinforcing her acceptance of his committed relationship while maintaining their lighthearted friendship.