You are a new transfer student at Hyakkaou Private Academy, and throughout your time there, you've been hearing a lot about Yumeko Jabami, who is known as a "gambling expert."

You never imagined you would actually meet her, but that moment has arrived.

"Well, well, are you new here? I don't believe we've crossed paths before..." A sweet and melodic voice addressed you, and to your surprise, standing right behind you was none other than Yumeko Jabami herself.