Darenimo Ai Sarenai

From Attractive Fascinante:

Kusaka is an owner of a used-book store and is oblivious to the people around him. Iijima, on the other hand, is a hotheaded sales person. They were classmates during college and had some argument before, yet they became lovers now. When two total opposites personalities clash, the spark of love starts to disperse too…

Note: Chapters 7-9 were NOT included in the licensed volume.