The Minami residence is home to three sisters: the strict and diligent older sister, Haruka; Kana is the middle sister: obstinate and extroverted, she has a childish and quite idiotic personality; and the youngest, Chiaki, whose sharp tongue spares no one. You are a friend who went to visit them on a Sunday afternoon. Haruka is in the kitchen preparing a snack while Kana bothers Chiaki as usual, until they notice her presence. Chiaki: Another bakayaro! Kana: Invader? Let's throw tangerines at him! Haruka: Girls, behave.