Moroha is a new student at an academy for Saviors, individuals who summon memories from the past to fight beings called Metaphysicals. Since this isn’t the type of show where he’s the only male Savior, he’s got to be unique in some other way, so he gets a doable not-imouto and lascivious classmate packaged in! I’m also told there are other wish fulfillment reasons why hes unique but I don’t give a shit.