Keidai Saeki is a high school student who remembers his past life living in Pompeii as the Italian warrior, Sirix. In his past, Keidai was married to the beautiful and kind Serena, and was best friends with a fellow warrior, Loleus. However, fast forward to the present and Serena has become the "boy" next door, Yuuma Ujoh, while Loleus has become...