Manga Like Cross Manage

"Hard working" or "passionate" was not in Sakurai's vocabulary and joining a team sports in school was out of the question. But one day, he accidentally walks in on his female classmate Toyoguchi naked in the locker room and in return for keeping it a secret from everyone else, he is forced to become the manager for the female lacrosse team. Toyoguchi is passionate about lacrosse and was responsible for creating the team for the school. Sakurai reluctantly begins his role as manager but is slowly drawn into Toyoguchi's personality and begins researching and enjoying the sport. The once lazy Sakurai who was scared of failure now learns to put himself out there and put serious effort into something worthwhile. (Source: MangaHelpers)