Immoral Guild follows Kikuru Madan, a veteran guard at Mebuki's local guild who has earned a strong reputation but feels he has already spent too many years in the job. He wants nothing more than to leave that life behind and retire early, yet his conscience keeps him from walking away while he still worries about the guild's future.
Trying to prepare for that future, the receptionist Enome assigns Kikuru four new recruits to train: the energetic beastwoman Hitamu "Hitamuki" Kyan, the prodigy Maidena Ange, the laid-back Toxico Dannar, and the stalwart Hanabata Nohkins. Each of them has real talent, but each also carries a flaw that makes Kikuru's task harder, from Hitamu's extreme clumsiness to Hanabata's unintentional perverseness.
Outside Mebuki's walls, the monsters have also begun acting strangely, targeting women salaciously and turning every outing into a fresh disaster. Between dangerous creatures, awkward trainees, and his own desperate wish to retire, Kikuru must guide the group carefully if he ever hopes to leave the guild on his own terms.
