Yuutarou Tachibana was an ordinary highschool student. Except that when he was little, he made a promise with two of his childhood friends, Yuno and Marie that he will make them his bride. One day, an organization who distrupts peace makes an appearance. They are the Army of Darknesss, Machine Empire. Lead by the evil leader, Machine President. “My objective is to find a bride! An bigamous marriage obviously!” In order to protect Yuutarou’s peaceful daily life, the girls transform using the mystical power of the rings! They fight as the Bishojo Bridal Warriors! “I will never become Mr. President’s bride. I’m gonna be Yu-chan’s bride!” “Uh, I’ll be Yuutarou’s bride too!” “Transform! Unity Marriage!” And so the two brides crashes into Yuutarou’s house. School life in the afternoon, and a very sweet time together during the night. Surrounded by two brides, a newly married life begins.