This manga/comic is about teenager that were curious about the demon and the underworld, they want to see if they were real or not, one day, when they had a school trip, they try to summon a demon using ritual, it was a bad idea…
Their nightmare’s come true, but only one that survive the ritual, and he have to be responsible of what he had done, to turn the world into a normal place again, a place where you can live.