Tsuki no Oki ni Mesu mama

Vol.1 Chapter 8.6: 4 Koma Special
Vol.1 Chapter 8.5: Omake
Vol.2 Chapter 9
Vol.1 Chapter 8.5: Omake
Vol.2 Chapter 9
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.