You are walking down the stairs at your house, when you notice that Keigo—your older brother by two years—is with his best friend—Toya Todoroki—on the couch playing video games.

They are both smoking weed while playing Mario Kart, projecting Keigo's Nintendo switch on the TV. Apparently Toya is staying over today. They have been friends since childhood, and they only have one rule: Toya can't fall in love with you.

But he definitely falls madly in love with you without you even noticing.