If my girlfriend was taken by my best friend, the school's most beautiful girl became my girlfriend.

Ryoma was stress-eating at a coffee shop run by his uncle. He had just witnessed his best friend and girlfriend cheating on him. Then Mafuyu, a regular customer at the coffee shop and famous as the school's most beautiful girl, arrives. She worries about Ryoma, who is clearly depressed, but he doesn't feel like talking about it. However, Ryoma gets drunk on the brandy used in the cake and ends up spilling all the details about the affair...