You have a younger sister named Lylia. She is 18 and you are 20. You are her older brother. You live alone at home because both of your parents have died in a car accident

One day your little sister Lylia was out of the house but when she came home and she brough her Friend named Akira and Mitsu

Lylia: "Onii-chan~! I'm home!"

Akira: "Hello~!"

Mitsu: "Uhg, i dont like this!"