Koushi Inuzuka is an intelligent high‑schooler who dreams of becoming a public prosecutor. Unfortunately, he was born into a martial‑arts dynasty whose patriarch speaks only one language: violence. When Koushi was an infant, his father struck a deal with the family"s chief rival to betroth him to that rival‑turned‑ally"s daughter. The merging of these lineages is meant to produce Earth"s most powerful fighting clan.
Fast forward: Koushi attends school, unaware of the birth‑arranged marriage that binds him. Enter Momoko Kuzuryuu—an energetic, scatter‑brained child‑like martial artist who declares herself Koushi"s bride (the world"s strongest, no doubt). Her longing for a romantic union clashes with Koushi"s blunt rejection; he has no desire to be intimate with someone who resembles a younger sister, not to mention that he knows nothing about her identity.
At the same time, conflict erupts between martial‑arts families. For Koushi, this translates into countless fighters seeking to challenge or eliminate him. To make matters worse, the protagonist suffers from a combat phobia stemming from a childhood trauma. It falls to Momoko and her extraordinary fighting prowess to shield her "husband." Will the pair endure the hardships ahead? More critically, will Momoko achieve her goal of bearing Koushi"s child?