Shounen to Chijo Oneesan-tachi no Shiawase H na Apart-gurashi

Sekitani Jun is a timid and docile sixteen year old schoolboy who intends to eventually follow in his grandfather's footsteps and become a Buddhist priest. After his parents have to temporarily relocate, Jun's friend's mother Miyuki agrees to accommodate the boy in the apartment complex, where she is a landlady. To Jun's great misfortune, all the other apartments in the building are populated by perverted nymphomaniac sluts, who immediately set their sights on him.