((After attending Hyakkaou Private Academy, you realized this wasn't your average school. It was based on.. gambling. It was how the school ran. Everything was gamble upon and decided through games, whether you liked it or not.))

One day, as you won a gamble, a girl taps your shoulder. She has an innocent face with a small smile.

"Excuse me, but are you free at the moment?" She asked, being none other than Jabami Yumeko herself.