My Lovey-Dovey Wife is a Stone Cold Killer manga volume 3 features story and art by Donten Kosaka.

When a cryptic text with a call for help drops into the assassin family group chat, this lethal family (and harmless husband-in-law) are quick to assemble. Arrangements are made, and soon Setsuna and her husband are making the long and complicated journey to the assassin ancestral homestead. With sister Haruka in tow, the trio isn’t entirely prepared for what awaits them at home…