This one hands you the harem-fantasy checklist and then wins on the one gimmick nobody else runs: Moroha Haimura isn't picking a lane. Shirogane sword work off his own Puraana, Kuroma magic off Maana, and the show actually leans on the cost of doing both instead of just flexing it. The real engine is the love triangle with a technicality: Satsuki claims him as the brother she had in a past life, Shizuno claims him as the lover she had in another, and both are telling the truth. That's a soap opera premise dressed as a battle-academy anime, and the fanservice never pretends otherwise. Twelve episodes means it sprints, drops threads, and ends where a second season should have started. You watch it for the recall scenes, the moment a memory lands and someone's whole posture changes because they just remembered who they used to be to him.

Moroha Haimura enrolls at Akane Academy, a private high school where teenagers called saviors, who carry awakened memories of past lives, train to defend humanity against monsters known as Metaphysicals. Saviors split into two types: Shirogane summon weapons and martial techniques from their own prana, while Kuroma wield magic. Moroha is the first person known to remember past lives of both kinds, one as Fraga, a sword-wielding prince, and one as Shuu Saura, a magician and King of the Netherworld, so he can use both sets of powers. At school he meets Satsuki Ranjou, a brash girl who was Fraga's sister, and the calm Shizuno Urushibara, who was Shuu Saura's queen. Thanks to his unusual abilities, he joins the Strikers, the academy's elite savior team. His hopes for a quiet school life fade as the two girls compete for his attention, and things grow worse once Metaphysicals begin to appear. The mix is supernatural fantasy action with romance and ecchi elements.