In a city so dismal it's known only as "the Hole," a clan of Sorcerers have been plucking people off the streets to use as guinea pigs for atrocious "experiments" in the black arts. In a dark alley, Nikaido found Caiman, a man with a reptile head and a bad case of amnesia. To undo the spell, they're hunting and killing the Sorcerers in the Hole, hoping that eventually they'll kill the right one. But when En, the head Sorcerer, gets word of a lizard-man slaughtering his people, he sends a crew of "cleaners" into the Hole, igniting a war between two worlds.

(Source: Viz Media)

[From Omanga]:

A research laboratory in the international city Kanazawa. Kei Sagami, daughter of the chief of laboratory, Professor Hiromitsu Sagami, becomes a witness of an experiment - the awakening of a sword, the Maken. It's able to heal mental disorders, at least according to her father. But as strange foreigners forcibly break into the laboratory, kidnap her father and put the actual carrier of the sword out of action, she experiences the true meaning of the Maken first hand.

A one-shot that appeared in the Shadows of the Damned artbook (which Hayashida contributed designs to), starring George Reed.

A compilation artbook/manga anthology, by Range Murata, with contributions by various artists.