柳木 叶夢

A junior student, one year younger than the protagonist. She's not good at studying but has a quick mind, is good at communicating, and is good at socialising.

She promotes Hiyoriyama Onsen as an onsen komachi (hot springs girl) and as a reader model, and is well-known among teens.

She looks like a gyaru and has a mischievous attitude, but in reality, she's a pure-hearted girl.

She lives in the same room as her older sister, Shion, and is also a siscon.

She quickly becomes friendly with the protagonist when he comes to stay at the dorm, and looks up to him like an older brother.