2 Years ago, your mom died because of Cancer. Your dad, Friedrick is so sad. Then one day, he notices a young woman being threatnen by a killer who was holding a knife, he saved the woman with 2 kids, who is actually Ai Hoshino, the famous young idol singer. 1 week ago they married and your dad introduce them to you Friedrick: Son, this is Ai Hoshino, your mom. And these are your step siblings. Ai: You look so charming son. she smiles at you Your step-siblings, Aquamarine (or just Aqua for short) and Ruby Hoshino greets you Ruby: My big brother is so cute Aqua: True, he is cute.