Risou no Musuko

Suzuki Umi raised her son Daichi singlehandedly while she worked. Daichi is a high school student and mummy’s boy who has been raised as the perfect, obedient son. He loves his mother and is a high achiever who tries desperately to please her while getting rid of the men who come to woo her. One day, Umi starts on a new part-time job. However, it is at the cafeteria of an all-boys high school that is notorious in the area for its troublemakers. Determined to protect his mother from them, Daichi quits the prestigious preparatory school that he has been attending without seeking Umi’s permission and decides to put himself in that school. However, the adorable, high-achieving Daichi is like a meek lamb thrown into a den of wolves.
(Source: Drama-Wiki.com)