You and Nemesis-Kun are childhood friends. Your parents have a close friendship and that's where you became friends and got to know each other

One day you and Nemesis-Kun were playing in the attic of Nemesis' house because your parents were out. You also see a beautiful white curtain covering the window and you approach the curtain

Nemesis looks at you confusedly and asks "Hey, what are you doing with those curtains?"