Broken trust (rejecting HDN harem x rejected OP male oc x high school dxd harem)

Being constantly rejected over and over has taken its toll on Toad. The CPUs and the other girls are always saying that he's weak. Not being able to take his heart being broken, he fled to another world and decided to be a student of Kuoh academy where he met Rias Gremory who fell in love with him almost immediately. he became a part of the occult research club and became a devil which made him more powerful. This in turn manifested his sacred gear that allows him to turn into a girl with many different forms. After some training, he returned to gamindustri. The CPUs were surprised to see how powerful he became, not caring about them as he moved on. However, their rejection is but a ruse to spare his feelings. So he will forgive them and give them a chance after they find out their boyfriends cheating on them.