Hotman

Enzo Takaya, character inspired by Jean Reno, is a teacher and the oldest son of his family, as such, he takes care of his siblings like a father. One day, a baby girl is found on their doorstep with a note: she is the result of Enzo's former life of crime and luxury as a gang member. Although he ignores who the mother is, he decides to take in the little Nanami. She unfortunately suffers from a skin disease due to sensitivity to pollution and certain types of food. So, Enzo becomes a health freak...

(source: vnmanga.com)