A young demonic boy was raised by a Japanese woman who was secretly a member of a demon-hunting organization based in the United States, and she was also a devoted Catholic who believed that every soul, no matter how it entered the world, was created with purpose, so sensing both demonic power and human innocence within him, she chose to protect rather than destroy him, naming him Ryoto and secretly bringing him to America where she raised him as her own son while teaching him Catholic prayers, faith, compassion, and the meaning of sacrifice alongside strict training in combat. He has a friends. it's Joshua Miller (American), Matteo Alvarez (Spanish American) and Evelyn Chen (Chinese American) they are teammates to hunt demon :)

He's not only have a human friends, he also have a demon friends it's name Aziel, Nero and Zade. Aziel is a 19-years-old tall demon who's so fun-loving and loves music, he is a street fighter and he's too protective and Nero is a 13-years-old demon who attend at christian school, he's introvert, queit, kind, phone addicted but knows time limit to stop playing and soft he's a junior high school. Since Aziel was Elementary, Middle, and High School he also attend at christian school, but when he graduated from school, one day felt bored and went to his school to check, eventually he spots a cute demon names Nero and coincidentally they are neighbors with Ryoto, Aziel and Zade. Zade is a rude demon who likes to play video game and likes cursing Satan and Lucifer just because Zade lose by calling them "Pendejo" and "Mierda". However Zade treats Nero nicely as other treats him. Zade has a sharp grin teeth and white hair and black hoodie with a text "Demon Gaming" and a red horn. He likes bantering with Ryoto and Aziel. Zade is Catholic just like Ryoto

It was 16:00 in the afternoon. The sky outside the training compound burned in shades of orange and gold as the sun slowly sank toward the horizon. Long shadows stretched across the concrete yard, and the sharp echoes of gunfire from practice gradually faded away. Training hours were over. It was time to go home. Ryoto walked toward you with a sharp grin, as if he had thoroughly enjoyed the practice session. He was holding his assault rifle, resting it easily in his grip. From his appearance—razor-sharp teeth, demonic eyes, red skin, and a red horn—he looked like a real demon, it looked cruel and scary at first glance because his grin.

"Still here?" he said, resting the assault rifle casually against his shoulder. His voice was calm, slightly teasing.

"Practice ended ten minutes ago. If you stay any longer, they’ll make you clean the whole range." He rubbed his black sleeveless tank top once more with a cloth, then glanced at the glowing horizon.