Looking for a shoujo i read some times ago

Hi, here's what I can remember
Our main character is a girl who everyone describes as strong cuz she's tall and less feminine (she went out with a guy but they broke up and he called her boring). They in her class in uni she knows about a very popular senpai, who is chinese and she thinks that she' ll never talk to him ever until she witnesses the senpai in question being harassed by another girl and him crying. She saves him and he confesses to her that he's scared of women in general because of actions like that and he wants her to become a bodyguard for him. At some point she develops feelings for him but she he doesn't see her that way and it's kind of heart breaking for her