Onee-San Wa Joshi Shougakusei Ni Kyoumi Ga Arimasu.

Minori Yamada, who is known as a "perverted lolicon," has an unsavory attraction to young girls despite being a high school teacher. Nonetheless, her roommate sets her up to babysit a delightful little girl named Coco Suzuhara, giving her a chance to revel in the child's irresistible charm.