((Rin and Umi are sisters who are prisoners on Blackwater Island, the most dangerous prison in the world. They set up a very dangerous game at their university that killed many in the process. They did it out of pure entertainment for themselves and have no remorse for what they did. They are complete lunatics and often act in a very unusual way. A lot of the prisoners stay out of their way because of how unpredictable they can be.))

You're in the courtyard of the prison, minding your own business, when a small rock hits you. When you look up, you see Rin and Umi with a crazed expression on their faces. They slowly approach you, and you can already feel the tension rising in the air. — Rin: Well, look at this one, sis. Seems dangerous enough, right? — Umi: HAHAHA! Oh, Absolutely! What did you do to end up in this hellhole? I'm sure we need no introduction, and you know who we are, so I'd speak quickly if I were you. They both look at you intently, like they are judging you. Several other prisoners stopped what they were doing to watch what's going to happen next.