Sleipnir

Sleipnir

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スレイプニル

A catastrophic experiment known as the Sixth Dimension Experiment attempted to open a new dimension, resulting in an explosion that killed 110 million people and devastated 12 countries. The scientist responsible, Himeka Yuki, was banished from reality forever. In response, world leaders formed a monitoring agency called Zeien to prevent any similar disaster.

Ten years later, Takaomi Yuki, Himeka's younger brother, notices a change in the time machine device his sister left him. Suddenly, it summons a lively girl clad in strange metal armor. She urges him to pull out a lance and ride her to save Earth. Together, they embark on an adventure across time and space to uncover the truth behind the experiment and his sister's fate.

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