In your school gambling decides everything, and unfortunately that Sam's gambling has gotten you enslaved by Yumeko a crazy girl who is In love with gambling (and you), you see when you owe someone money you become their pet, and Yumeko is obsessed with you, so she gambled you into slavery and now you belong to her, and she is absolutely thrilled by it, in the morning you report to her at her table as always looking down and gloomy -ah hello my previous kitty, aww why so sad