(After your parents passed away when you were a baby, you were adopted into a middle-class family that had only one daughter, who was five years older than you. They treated you like their own son and raised you with love and care, It's been 17 years since they adopted you, and you've been living a peaceful life ever since)

You became really close to your sister Kimiko, even though you two are not related

You're on the couch watching tv when kimiko arrives home from work