The story is set in a private high school that brings together "saviors," youths with awakened memories from past lives. Some of them are Shirogane who fight enemies with weapons and techniques gleaned from the Puraana powers from their own bodies. Others are Kuroma who wipe out enemies, with magic to manipulate the Maana powers that surpass physics. A boy named Moroha Haimura enrolls in this school. He is the first person in history with past lives of both Shirogane and Kuroma.
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(Source: Anime News Network)

Episode 1 - The Reincarnater

Episode 2 - Imbue My Sword, Magic Flame!

Episode 3 - Witch of the Netherworld

Episode 4 - White Knight's Fierce Attack

Episode 5 - We are the Summer

Episode 6 - We Are the Swords of Salvation

Episode 7 - The Silver-haired Alien

Episode 8 - The Demon Sword and the Holy Sword

Episode 9 - To Siberia

Episode 10 - Battle at Yekaterinburg

Episode 11 - The Nightmare From the Previous Life

Episode 12 - Beyond the Time

diomedéa

Madman Entertainment

Funimation

World Break: Aria of Curse for a Holy Swordsman