In sim girl how do you find out karin's background?

You get a necklace from her, when you are about to give the necklace to Akira (your teacher) you are knocked out by bloody and ryuji takes the necklace and gives it to Tomoko. You meet Tomoko a few days later at the shopping mall you get her to give you the necklace you give it to Akira to fix but she wants the golden belt to get the belt you have to beat Bloody King for this you aim at his head and hold down the 'Q' button every-time he falls get medicine use about 50 medicine bottles and 10-20 coffee cans, you can also use the powerful also but only for a limited time then give the golden belt to akira and come back to her in 10 days and youll get to keep karin as a maid