Main character is a delinquent if i remember correctly and he starts working at his female classmate's owned inn which is female only.not sure about the delinquent part tho. So he works there as a caretaker-cleaner. Its a harem romance ecchi manga,at one chapter i remember the girl's mother comes to visit and he mistakes her as their older sister.its stuck on my head since i lost all bookmarks i had and i cant remember it

Rabuyu! maybe ??