Jingi Naki Mukotori仁義なき婿取り; 没有仁义的上门女婿; Snake & Butterfly; Unrighteous Son-in-law; Virtueless Son-in-law

....This is a wedding battle royale that involves no male virtue that revolves around a single woman (the granddaughter of the boss of the gang that controls Japan's underground society, the Tsukijou gang; she is a person who is only attracted by good looks, loves cats, and is a normal highschool girl in the daytime!!! If one marries the granddaughter of the boss of the Tsukijou gang, Tsukijou Ageha, obtaining the rulership of the underground societyーー is not an impossible feat! But I want to meet the love of my life and have a lovely romance...! That's right, with a cute and kind person just like Kira-kun whom I love... In contrary from Ageha's daydreams, now then, this Kira-kun. His true colours are...?