Daikenja Riddle no Jikan Gyakko

We all wish we could go back in time, to turn back the clock and fix the past. But in this reality, that simple wish brings about something deadly—demons that devour time! It’s up to a group of strong warriors who fight using time manipulation to destroy these blights. Victor, Kiri, Mina, and Blaze have what it takes to maintain the balance of time as the chosen fighters—the Chronos Rulers.

The story is set at Myoujou Academy, a private girls' boarding school. The 10th year's Kurogumi class has 12 assassins with their sights on one target, Haru Ichinose. Tokaku Azuma is a recent transfer student who is also targeting Ichinose, but she gradually develops feelings for Ichinose.

One day, Kasuga Nozomi encounters a strange boy at her high school, who sends her across time and space to Kyou, a place in another world that bears a strong resemblance to Kyoto towards the end of the Heian period. There, the Minamoto clan ("Genji"), led by Minamoto no Yoritomo, is at war with the Taira clan ("Heike"), led by Taira no Kiyomori. The Heike hope to defeat the Genji by releasing vengeful spirits to disturb the earth`s natural flow of energy and to terrorize the land. The boy is revealed to be the human form of Hakuryuu, the White Dragon God that protects Kyou, who is weakened by the presence of the vengeful spirits. As the Hakuryuu no Miko (Priestess of the White Dragon God), Nozomi allies herself with the Genji because Hakuryuu cannot send her home until his power is restored...

While innocently enjoying himself after work, one man’s life changes forever. He wakes in the body of Liam Hamilton, the youngest son of a noble house on the brink of collapse. Amid the chaos, Liam realizes he finally has time to learn and practice magic. Once he begins, it takes his life for an even bigger turn. Can Liam master magic and save his noble family? The aristocratic fantasy begins!