 Kōshi Inuzuka is a normal high school student who is aspiring to become a prosecutor after graduating.One day, a strange girl named Momoko Kuzuryū approaches him and informs him that they are betrothed and expected to produce a strong child together, though Kōshi does not accept it.The betrothal came about after Kōshi's father and Momoko's father both arranged the marriage between their respective kids.