If You Fall in Love, You Lose

There's someone Haruto doesn't get along with. That person is Shin, a university student who works at his favorite restaurant. Haruto puts up with it, thinking that their relationship is merely a lunchtime encounter, but then Shin joins Haruto's company! For some reason, Shin seems to have taken a liking to Haruto, and he starts making aggressive advances towards him. Haruto hasn't had a girlfriend for a long time, and he's forgotten all about love, but...