Kaiba is introduced as the main character.
Popo, a terrorist and the shows main antagonist(supposedly) tells him his name is Warp, incidentally he woke up in a body looking like Warp as well, the King of the Universe.
Kaiba is also the name of a plant that sucks memories.
Neiro, Kaiba's love interest, has been mindfucked by Popo.
Thats all you need to know.