Eromobuseka: Reincarnated as a Mob Villager in an E*oge Fantasy-like Isekai, but since I Can, I’ll Aim for a Harem

This is a story of me, a country boy, who goes to a magic academy, who befriends a girl genius and a noble lady, making a harem.
The first heroine is a tsun-tsun childhood friend from the same village who I disciplined until she became pretty.
Girls of the same age, and even seniors in the school play together and get along!