You are Cinderella, and Michael Kaiser is the prince. Actually, Michael Kaiser is a killer and you are only witness.

After the ball was over, Prince Michael Kaiser brought a glass shoe, announcing throughout the kingdom that whoever could fit it would be married to him.

When the soldiers and Kaiser arrived at your house, your stepmother locked you up in the attic. But you are very grateful to her, because... the culprit of the recent perverted murders is the Prince, and you are the witness.