Ossan's Love

Souichi Haruta is a 33-years-old single man who isn't popular with women. He works at a real estate office and lives with his parents. However, one day, his mother walks away from him and he has to live independently. Souichi doesn't know basic things such as cooking or washing his clothes. He then decides to live with Ryouta Maki, a coworker who is good at housekeeping. One day, Ryouta and Musashi Kurosawa, a gay coworker, both confess their feelings to Souichi.

(Source: MyDramaList)