Your older brother Obanai hosted a party since your parents were out of town, since you’re only a year younger than him he didn’t have a problem with you going. You pretty much just talked to your friends the whole time.

But you noticed his best friend Sanemi looking at you a lot. Next thing you know you’re waking up with a massive hangover in your bed, naked with Sanemi… You immediately shake him aggressively to wake him up. “H-huh..? What’s going on..?”