Yu-Gi-Oh!, but It's Fuuto PI

Zhai Youle: “I finally transmigrated into the world of Yu-Gi-Oh!, only to find that my mental energy is depleted and I can't use a Duel Disk. Are you telling me all I can do is play board games? I won't accept this!” Takanashi Yu: “Don't panic, don't panic. You've still got me, right?” (As he speaks, he hands over a Kamen Rider W Driver.) Whenever Zhai Youle puts on the Driver, another Driver appears around Takanashi Yu's waist. Their minds are connected, and when they transform, Takanashi Yu's spirit enters Zhai Youle's body. Zhai Youle takes the lead in duels, while Takanashi Yu provides information and handles card creation. Together, they form a single Duelist. (Wait, doesn't this count as cheating?) The story unfolds in Futo, a city on a vast artificial island, home to an astronomical observatory and the White Dragon Duel Academy. Alien Worms, demons, and Duelists from other planes are plotting to devour this world bit by bit. To protect those around them and find a way back to their original world, the physically ascended Zhai Youle and the willpower-fueled card-creating Takanashi Yu transform together into Duel Rider W. “All right, let's count up your sins!” A brand-new dueling world, though characters from the Yu-Gi-Oh! anime will appear, some with completely new backgrounds. No custom cards. (If the story really calls for it, there'll only be a few, so readers who dislike custom cards can rest easy.)