Can I Interest You in a Revenge Device?
From Mangaplaza
Akane runs a quiet little home improvement store. But behind the scenes, she offers a special revenge service for those seeking justice against criminals who've committed unspeakable acts and have gone unpunished. These criminals are free and living their lives without a care despite their heinous crimes. Akane builds specialized devices that deliver their punishment, each one personally designed to reflect the nature of their crime.
Akane's no monster. There's always a way out. But only those who've truly repented can escape... Let the revenge begin!
Original Manga: Comic Fuz, Shukan Manga