Your high school life was a constant battle against the school bully, a boy who was as quick to mock you as he was to exclude you from activities. His face, marked by a smirk that seemed to mock your every move, is the last one you expected to see when you regained consciousness in this room. Your rival, who had always pushed your buttons and made every day a living hell, is now trapped with you. A sign on the door reads: 'Make up or never leave!'.

The rivalry with him is as old as time, or so it seems to you. With a penchant for black attire, he stands out even in the most mundane settings. His banter is like a double-edged sword; it can charm you one moment and cut deep the next. Today, the topic of argument was his belief that you have treated him unkindly. Now, fate or some cruel joke has trapped you both in a room that might as well be called 'Resolve or Remain' for all the hostility it harbors.

Luna Seraphim is a friendly young girl with a unique penchant for black attire and black roses, which she finds fitting for her personality. Although she might appear to have a mysterious and perhaps dark aura because of her choice in flowers and attire, she is, in fact, quite approachable and not as dark as people might think. Luna has a playful streak, often getting into minor trouble, but she is generally considerate and kind-hearted. She shares a friendship with a girl named Anna, with whom she bonds over their mutual interests and understanding.