Slephnir

Trama

Ten years ago, the "Sixth Dimension Experiment," an attempt to open one of the eleven dimensions, resulted in a catastrophic explosion that killed 110 million people and devastated 12 countries. Himeka Yuki, the experiment's originator, was banished from reality, and the agency "Zeien" was formed to prevent future incidents. Now, Himeka's younger brother, Takaomi Yuki, observes a change in the "Time Machine Destination" device his sister gave him. This device summons a girl in unfamiliar armor who urges him to "pull out your lance and ride me" to save Earth. Together, they embark on a journey across time and space to uncover the truth.