Keidai Saeki is a high school student with memories of his past life as Sirix Lucretius Fronto, a gladiator in Pompeii who lost his wife Serena in the eruption of Mount Vesuvius in 79 AD.

[6][7] When Keidai falls into a coma, he is able to relive the last moments of Pompeii where his actions put Sirix's suffering to rest, allowing him to move on with his life and confess his love to Mii.

[8] Keidai is a high school student with memories of his past life as Sirix Lucretius Fronto (シリクス ルクレティウス フロント, Shirikusu Rukuretiusu Furonto), a Pompeiian gladiator.

[10] Yuuma is the reincarnation of Sirix's wife Serena (セレナ), a maiden who captured the hearts of men with her beauty and kindness.

[17] He began working as a student teacher at Keidai's high school after Yuuma's family moved to town.

[17] The reincarnation of a noblewoman named Aglaia Felix (アグライヤ フェリクス, Aguraiya Ferikusu), Shuna was reborn into a wealthy family and retains memories of Pompeii.

[18] When she was two years old, she called her newborn sister Serena due to their physical resemblance; her parents, misheard and named the child Reina.

[19] At the age of 10, Shuna meets Souichi Mikage, who also retains his memories of Pompeii, where he served as her bodyguard henceforth.

Shuna initially hates Souichi due to his past betrayal, but her feelings for him grow over time and she falls in love with him.

[20] Reina is Shuna's younger sister who closely resembles Serena and dresses in gothic Lolita-style clothing.

[8] Souichi is the reincarnation of a mercenary named Delos (ディロス, Dirosu), who served as a bodyguard to Lady Aglaia in Pompeii but later betrayed her.

[19] Later in the series, it is revealed that Delos fell in love with Lady Aglaia even though he was mercenary hired by the House of Britius to betray her.

[40] GraphicNovelReporter.com's Courtney Kraft comments that the art style is adequate but criticizes the "kookyness" citing the drama at the end of volume one was necessary to balance it.

[41] Comics Worth Reading's Johanna Draper Carlson heavily panned the manga for its art and "two-dimensional characters that are predictable and uninteresting.