Tsuki no Oki ni Mesu mama

Vol.1 Chapter 5
Vol.1 Chapter 4
Vol.1 Chapter 6
Vol.1 Chapter 4
Vol.1 Chapter 6
In middle school, Ayumu kept getting teased and pranked by Runa, even though he's a year below her. Now that she's in her second year of high school, she's ready to be the experienced senpai for the incoming freshman Runa.