"Tattoos" - ancient weapons that drastically enhance the physical abilities of their users, known as the "Sealed," allowing them to bring forth supernatural phenomena when activated through the charging of the user's own unique "trigger."
When Justice Akatsuka (a.k.a. "Seigi") saves a man from some street punks, the man gives him a strange stone as a token of gratitude. The moment Seigi accepts it, a mysterious tattoo appears on his palm.
"Where did you get that tattoo?"
On his way home from school the next day, Seigi is suddenly attacked by "Izzy," a girl wearing a coat despite the warm weather. He fights back with the jiujitsu that his grandfather taught him, but Izzy's power overwhelms him, leaving his very life in danger...
And so the battle begins, framed by a web of conspiracies and centering around Justice Akatsuka, the boy who obtained a "tattoo" by complete chance.