Taboo Tattoo - S01

Middle schooler Seigi is pretty ordinary, except for his martial arts skills and his wish to protect those who can't defend themselves. But when he saves an old homeless man from some street thugs, the mysterious stranger thanks him by burning a tattoo onto his palm. It turns out the tattoo is a powerful secret weapon that everyone wants, including a tough girl with a tattoo of her own. With his life on the line and his martial arts alone no match for super-powered enemies, can Seigi unlock the hidden power of his tattoo and live to fight another day?