Twenty years ago, the Tower of Genesis appeared in the world without warning. Reaching high into the sky, the tower became humanity's greatest mystery. Those who managed to enter and survive gained power beyond human limits, becoming known as Hunters. However, not everyone who entered returned—inside, terrifying monsters lurked, guarding secrets yet to be uncovered.
Haruto Kazuki, an unambitious office worker, was suddenly sucked into the tower for no apparent reason. However, instead of starting from the lower floors like other Hunters, he found himself stranded on the uncharted upper floors. There, he encountered humanoid monsters that were not only powerful but also dangerously alluring.