It Ends When You Flirt With the Flies.

Uji and Sabae, both university students, are good friends from the same club.Uji has feelings for Sakurai, who is both popular in their club and Sabae’s best friend, but he hasn’t been able to talk to her much. Uji often seeks Sabae’s advice about his love life, but he frequently gets distracted by her large chest and risqué jokes. This makes him start seeing Sabae as a woman, leading to many moments where they share a good vibe, making his heart race. (Source: Drama-Otaku)