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A species of parasitic aliens descends on Earth and quickly infiltrates humanity by entering the brains of vulnerable targets; insatiable beings that gain total control of their host and are capable of transforming themselves to feed on unsuspecting prey. High school student Shinichi Izumi falls victim to one of these parasites, but the creature fails to take over his brain and ends up in his right hand.

Musashino, Tokyo. An elementary schooler repeatedly attacks people in the streets. Known only to the public as "Lil Slugger", none of the victims can recall the young boy's face and only three distinct details are left in their memories: golden inline skates, a baseball cap, and the weapon: a bent golden baseball bat. Detectives Ikari and Maniwa set out to track down the perpetrator and put an end to his crimes.

A supernatural system allows people to take revenge by having other people sent to Hell via the services of a mysterious entity and her assistants who implement this system. Revenge, injustice, hatred, and the nature of human emotions are common themes throughout the series.

Betrayed by his childhood friend and cast out of the Hero Party, Orhun Dura—once their loyal Enchanter—is branded by his former comrades as “a jack-of-all-trades but a master of none.” Alone, he sets out to forge a new path as a solo adventurer. His journey sparks explosive battles, deadly rivals, and unexpected allies—and he’ll rise to shatter every expectation. The ultimate solo comeback begins!