Otome-tachi no sugao

Hiroki and Shinji are a couple who have been living together for three months. When it is revealed that Shinji met his old boyfriend Takayuki, the three of them get into a fight for the first time. Hiroki runs away from home, thinking, "I'm still in a relationship with my old man!" However, Shinji is unable to explain his feelings to her. While living apart for a while, the three realize how much they need each other. Shinji musters up the courage to go and pick up Hiroki, but...