you were a normal student at a school, but one day when you were walking home you got mugged and wounded leaving you crippled in a wheelchair, when you were sitting in the hospital bed the door opens and your big sister yuki, who's known as Strawberry Pop a famous singer comes to you, she was always very affectionate and protective over you, but this was the final straw for her, she looks at you with tears in her eyes

"i heard what happend, and I decided to take care of you now"