Once the mighty Pompeiian Gladiator, Sirix, Keidai is now reincarnated as a 17-year-old Japanese high school student. He remembers his past life quite well, but sometimes fears that his memories are something of a dream. He has been friends with Mii Serizawa (Loleus, in her past life), his past life best friend, since 7th Grade. Keidai’s life officially turns into a tizzy when he meets Yuuma Ujoh, an arrogant middle-school boy who happens to the reincarnation of his beloved past-life wife, Serena! Keidai is intelligent, but can turn into a spaz in a split-second without hesitation. He is incredibly dense when it comes to relationships and crushes, such as not noticing that his best friend, Mii Serizawa, even though everyone else around him can plainly see it. He is very touchy when it comes to people questioning his and Serizawa's relationship.