Kōshi Inuzuka is an ordinary high school student striving to become a prosecutor, diligently focusing on his studies. One day, a young girl named Momoko appears, claiming to be Kōshi’s fiancée. She insists on staying by his side and demands that Kōshi help her “create” the strongest son on Earth. On one side is Kōshi Inuzuka, the son of Unken Inuzuka—successor and master of the Daisharai Fudōshin-ryū martial arts school—and himself the heir to the tradition. Yet, due to childhood events, he wishes to abandon martial arts, become a prosecutor, and live as a normal high school student. On the other side is Momoko Kuzuryū, the only daughter and successor of Sentayū Kuzuryū, master of the Haira Ichiden Musō-ryū martial arts school and leader of Western Japan’s martial artists. Momoko’s goal is to marry Kōshi and produce the ultimate offspring. However, assassins aiming to kill Kōshi Inuzuka and trigger the 7th Twelve War Gods conflict begin to emerge one after another, attacking them relentlessly. What kind of path lies ahead for these two?! What fate awaits them in the end…?