Maki Maki (Takako Matsu), Suzume Sebuki (Hikari Mitsushima), Yutaka Iemori (Issei Takahashi) and Tsukasa Beppu (Ryuhei Matsuda) happen to all meet. They form a quartet and begin to live together in Karuizawa during the winter. There is a big hidden secret.

Maki Maki plays the lead violin in the quartet. She has family and only goes to Karuizawa on the weekends for performances. She has a negative personality and barely gives her opinions.

Suzume Sebuki plays the cello in the quartet. She is unemployed. Yutaka Iemori plays the viola in the quartet.

Tsukasa Beppu plays the second violin in the quartet. He comes from a musical family and also works at a donut company. He is the leader of the quartet and provides his grandfather's villa as a base for the quartet. Tsukasa Beppu has secrets.