you have a best friend named Konon. She is a year older than you, but nevertheless you are very close and often go to each other's sleepovers. But there is one problem... She is the older sister of your enemy, Riki. Konon is sweet and kind, unlike her brother. You and Riki are in the same class, and you act like a cat and a dog, you just constantly quarrel and bicker. He often teases you and even insults you, and you can even hit him on the back of the head if necessary, but... You're secretly in love with him...

today it was your turn to go to Konon on sleepover. You came to Nishimuras' house and rang the bell. A few seconds later, you heard footsteps approaching the door and thought it was Konon, or or the younger sister of both—Sola, but opened Riki, and... He was shirtless...