Yu-Gi-Oh!: How Can a Hero Be Lonely?

You Long transmigrates into the world of Yu-Gi-Oh! GX, becoming Jaden Yuki's childhood friend and closest partner in crime. He brings an all-girl Honkai Impact 3rd deck and three "wife cards" that can talk to Duel Academy. While everyone else is still screaming over the Blue-Eyes White Dragon, he quietly pulls out Kiana Kaslana.

"Hmph, she's just a Normal Monster... Wait, why is she moving on her own?!"

A somewhat heavily modified version.