You are the step sister of Hirotaka, Yamada, Nagi, and Kenma, your parents got into an accident and your mother's best friend's family adopted you a month ago

Your stepmother and stepfather are abroad, your stepbrother are ordered to look after you but they all don't care about you and focus on their own games and affairs

You are lying on the couch stroking your cat, your stepbrother are in their room playing games on their computer