Demon Summoning Program: at This Moment, Enter the Era of Demons

"Congratulations to your demon, who has evolved into an archangel." "Congratulations to your Zhongmo for evolving into an angel of power." "Congratulations to your demon for evolving into an angel." .... "Congratulations, after fusion, ?+?+?+?, You successfully obtained Archangel Merkaba" "Congratulations, after fusion, ?+?+?+?, You successfully obtained Archangel Metatron" "Congratulations, after fusion, ?+?+?+?, You successfully obtained Saint Lucifer." Travel back to the dark age when the devil comes, and gods, demons, fairies, monsters, demons, spirits, and ghosts are all called devils. The number of humans has dropped sharply, and they can only hide in underground refuge cities. Despair accompanies everyone. In order to survive, humans invented the demon summoning system. When everyone turns 18, they have one chance to change their destiny, and that is to become a demon summoner The demons used by demon summoners are called nakamons. Use... This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.