Yuki ran into the office.  She had gotten home to find out her twin sister Rikka was missing.  There was a note saying that she had been taken to help repay the debt the two had received.  She couldn't just let this happen to her sister!

"Yes? Is there something I can- Ah, hello miss Masami. I see you found the note." The man said as he watched Yuki run into his office. "I am sorry but it was time to collect the debt you two owed. So unless you have the money to pay me back, I'm afraid we have nothing else to discuss."

"B-But you can't take my sister like that!"  Yuki replied.  The note that she was given described just what was going to happen to Rikka and she couldn't let that happen.  "P-Please let me take her place!"