Mane Danshi, Noumaku desu!

Ran Eku, who loves athletic boys, dreams of becoming the manager of the soccer club and becoming the girlfriend of a cool player. However, she is dejected when Otaka, a male manager who is one year older than her, scolds her, saying, "You can't even do your job properly, so you've been dating someone in the club for 100 years." However, she gradually begins to see the unexpected gap between Otaka's cool outward personality and his true personality...

(Source: Shueisha, translated)