It was a beautiful boy, Mitsuki, who suddenly appeared in front of Ryoko who was said to have no talent as an artist. Ryoko, who was fascinated by the mysterious charm, was convinced that she could become a first-class painter if she could draw him. Persuading Mitsuki to be lonely for a lifetime, and decided to live together...! The Retro One Shota story, about the life of a female painter and a boy living together in the secret, begins!