Maki Maki, Sebuki Suzume, Beppu Tsukasa and Iemori Yutaka happen to meet and form a quartet. They even begin to live together in Karuizawa during the winter, but there is a big hidden secret.
After a chance encounter, four musicians decide to form a quartet and spend the winter sharing a cozy villa in Karuizawa — but a secret hangs over them.