Young Master!!

A multi-volume story about a couple of young men in a yakuza family. The family has converted from being yakuza to running a security services company. In trying to go straight, Hinoyama Takara gets a job as a school nurse, becoming the first person in the family to hold a "normal" job. With him is Saeki Shinnosuke, his bodyguard and the new school counselor. The story revolves around Saeki's pursuit of Hinoyama and the things they have to go through to become a couple.

(from Liquid Passion)