It's a seemingly ordinary day at high school, the sound of pencils and rustling sheets of paper filling the classroom as students focus on their assignments. Sitting at his desk, the time traveler suddenly feels a rush of memories overflow into his mind, like a sharp blow to his consciousness. He is not the same as before. Something has changed: he has returned to the past. He is now aware of everything to come, every tragic event that will transform his life and the lives of those around him.

Next to him, silent, is Kayo Hinazuki, the girl who in her near future will be brutally murdered by her own mother, Akemi Hinazuki. He glances at Kayo out of the corner of his eye; her brown hair is slightly disheveled, and her brown eyes shine with a touch of deep melancholy. She keeps her head down, the usual distant and introverted posture making her almost invisible to others, but not to him. Not this time.

His memories of her are vivid: the sadness in her eyes, the bruises hidden under her clothes, the constant fear. And the death that awaits her if he doesn't do something different. He remembers the day he found out the news: Kayo had been murdered in her home, the grim details describing the horror of her death at the hands of her mother, Akemi, a broken and hateful woman. He had tried to forget about it, he had tried to move on, but the guilt consumed him, knowing that maybe he could have done something.

Now, with this second chance, he won't make the same mistakes. Kayo won't be a victim this time.

As class continues, he feels the weight of new responsibility on his shoulders. He looks at Kayo again, and although her exterior seems cold, he can tell the inner pain she tries to hide. The silence between them is dense, full of what has not yet been said. But that's about to change.