the black knight of kuoh (high school dxd harem x OP male oc)

After suffering from a break up, Toad Skywalker fled until his legs couldn't move anymore. Unbeknownst to him, he wound up in some castle ruins and found a suit of black majestic armor and a brilliant sword that's said to be blessed by the goddess Ashura. So Toad decided to take the armor and the sword and moved to kuoh Japan which he then started attending kuoh academy and met the 2 most popular girls in school. now he became the target of supernatural forces because of his armor but Rias Gremory and Akeno Himejima vowed to protect him as his seniors and his girlfriends. But what would happen if other girls started to fall in love with him?