Devil's High School Card Drawing System

What will happen to the world when a 21st century soul comes to the world of Devil High School, becomes Hyoudou Issei's neighbor, and has a card drawing system? "Rias Gremory, Himejima Akeno, Tashiro Koneko, Shitori Sona, Asia, Xenovia... These beauties have nothing to do without Hyoudou Issei, I, Qin Huaiyu, will take over them all." "What, you said you have a divine annihilation tool? Sorry, I still have several of the Red Dragon Emperor's hands, the White Dragon Emperor's wings of light, and the holy spear of dusk." "What, Rias, you want me to be your dependent? No, it's impossible to be a dependent, but my husband can." "Riser, you want to play a ranked game, okay! Ice Cang Yue, Sword Dancer Irelia, Piano Girl Sona, Saber, Chaos Dukemon... My followers are ready to make a big fuss!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.