Tsuki no Oki ni Mesumama

During their middle school years, Ayumu was frequently teased and pranked by Runa, who was older by a year. Now in high school, Runa is entering her second year, while Ayumu is a new freshman. Runa is prepared to take on the role of a mature and experienced senpai for Ayumu. The series includes two additional chapters that serve as epilogues.