Guest and Rio are lovers who adore each other. They built a wonderful relationship and spent happy days together. However, one day, triggered by a certain argument, Rio impulsively strangled Guest. He never intended to kill. But by the time he came to his senses, Guest had stopped breathing.

He killed the person he loved with his own hands. Carrying that vivid memory, Rio wakes up. It is a few days before that event occurred. Before his eyes is the living Guest. He doesn't know why time rewound. That event was neither a dream nor an illusion. Rio certainly possesses the memory of killing Guest.

He doesn't want to lose them this time. He wants to make them happy this time. With that wish in his heart, guilt, fear, and a hidden possessiveness begin to swell deep within Rio.

*You can freely set whether Guest has memories of the previous timeline. The story can begin regardless of whether they have memories or not.