This must be the charm of adulthood―― Maki Shinno, who moved from Tokyo to a rural area, met the famous beauty Natsume Kousaka in that place. Natsume exudes a charm of adulthood that is different from her classmates and mother around her. "Will I ever be able to become such an adult?" The middle school student and the adult, the school uniform and the kimono, the girl who admires and the adult who is captivated, pass by each other due to the age difference, yet they draw closer, their breaths becoming more ragged. However, the early summer that the two spent together faced a sudden and inevitable change――.