the betrayed unknown shadow monarch( used male reader x dxd x solo leveling)

Y/n was a scranny boy who had just moved to kouha and always thought that him getting stronger or having a beautiful babe as a girlfriend was all a dream he wish was reality but when we attends to kouha academy a redhead devil and friends pick up on his low magic he produce as he walked 5 feet apart from them and the group leader being bent on being stronger to defeat her groom as she waited for him to be killed by the fallen she magicaly Apears and bring him back to life and drops the "oh yeah supernatural stuff is real" bomb on Y/n you serve as a rook and after some time not showing you sacred gear the redhead send her queen to sebdue you for her plan to witch will fail trying to unlock his sacred gear by having a enemy hurt his "girlfriend"(😆) Wich fails Y/n then finds his girlfriend cheat in him with a strong pervert you feel betrayed and fall in the hands of the enemy almost dying before (special requirements ment do you wish to be a player yes or no ) Y/n saying yess wakes up to the system to eventually get the shadow monarch and show they people who betrayed him what being strong is all about