Rent a Girlfriend

Rent-A-Girlfriend (Japanese: 彼女、お借りします, Hepburn: Kanojo, Okarishimasu) is a Japanese manga series written and illustrated by Reiji Miyajima

After being dumped by his girlfriend, a college student enlists a dating service to "rent" a girlfriend who, unbeknownst to him, happens to be both a fellow student and his neighbor.