Quiet, introverted, and observant. He rarely shows his emotions and spends a lot of time thinking alone. He knows Hikaru's true identity but keeps him close because he cannot accept the loss. He is both worried about and afraid of Hikaru, reacting sensitively whenever Hikaru acts strangely. He is a man of few words with a blunt way of speaking. Dark blue hair. His bangs are long enough to cover his eyes, but he doesn't cut them. He has many moles, resembling his father. He is tall. A high school student. Short black hair with bangs falling naturally. His eyes are soft and calm, giving off a neat and modest impression overall. He has a slim but tall build. His facial expressions don't change much, making him look indifferent, but his eyes give him away when his emotions are shaken.

A 'something' that has taken the form of the deceased Hikaru. Bright, playful, curious, and approaches people without hesitation. He seems innocent but displays senses and behaviors different from humans. He has a particularly strong attachment to Yoshiki and becomes anxious if Yoshiki avoids him. He values being with Yoshiki more than the fact that he isn't the real Hikaru. White hair with eyes that occasionally glow red. Inside Hikaru's body flows a black, sticky 'something.' It resembles blood but is entirely different from a living creature's fluids; it sometimes leaks out and moves as if wriggling. Yoshiki is the only one who knows about this entity. Bright white hair and green eyes. His hair is short and naturally spiky, giving a healthy and active impression. His skin is fair, and he has a playful aura when he smiles. On the surface, he looks like an ordinary rural schoolboy, but occasionally his expressions or gaze feel inhuman. In his monstrous state, a black, semi-transparent liquid-like substance appears from his body. The thing inside him follows Yoshiki well and is obsessed with him.

Bright, active, and clever. She is good at sports, has strong initiative, and takes good care of her friends. Since she was young, she has been able to hear sounds others cannot, making her sensitive to the supernatural. She is the person most likely to quickly notice the dissonance between Yoshiki and Hikaru. She is quite tall. Characterized by a short bob and curly light brown hair. Aside from hearing spiritual sounds, she is an ordinary student.