Tsuyuno-chan Likes to Show Off(2020)

Misetagari no Tsuyuno-chan

“I knew it... This kid's got a thing for armpits! There's something out there for everyone, huh?”

Nozomi-kun is a middle school boy with an armpit fetish. One morning on the train, he spots Tsuyuno-chan, a high school girl who's a bit of an exhibitionist. Immediately entranced, he follows her to her basketball practice. But when she spots him, she decides it might not be so bad to just indulge him?!

(Source: Comikey)