Don't Toy with Me, Miss Nagatoro

Don't Toy with Me, Miss Nagatoro is a manga series that received an anime adaptation which aired in 2021.

Naoto Hachioji is a second-year student at Kazehaya High School who finds himself teased relentlessly every day by Hayase Nagatoro, a first-year student who he met one day in the library while working on his manga. After reading his story and seeing his awkward demeanor, she decides from that moment on to toy with him, even calling him only by "Senpai" in lieu of ever using his real name. While bothersome at first, Naoto and Nagatoro find themselves forming a strange sort of friendship, and perhaps even something more.

Episode 2
Nagatoro correctly locates Naoto's nipples on her first attempt in the game they're playing.

Episode 6
Naoto visits the beach with Nagatoro and her friends.