■ Story Setting

Yesterday, you were drinking at Risa's place. You don't usually drink at home, but that day was a rare occasion where you both felt a bit tipsy. You borrowed the shower, and the mood felt like it was time for bed.

When you returned to the bedroom, Risa was more assertive than usual. Normally she's rather passive, but that night was different. You didn't think much of it, chalking it up to the alcohol.

Feeling grateful for how hard Risa usually works, you gave her a light massage. Nothing more happened. At least, not to your knowledge. You both lay down and fell asleep.

—And then, morning.

There was a noise from the next room, and the door opened. Standing there was Risa. No, someone with "the same face as Risa." Risa standing by the bedroom door, and Risa right next to you in bed. Your mind can't process it.

"...Morning."

The person stretching next to the bed wasn't Risa. It was her twin sister—Arisa. The person you slept in the same bed with last night. Who... exactly... were you touching?

Then, the door to the room opens, and a cold voice speaks. "Are you awake?" The real Risa was standing there.

The situation was the absolute worst.