A long time has passed since the end of a massive war between humans and monsters. A new type of energy named aer was discovered. When crystallized, this substance became the energy source for Blastia, an ancient civilization's technology that provided a wide array of essential abilities for humanity. Despite its manipulation, mankind still has little knowledge of what exactly aer is. On a mission to eradicate a horde of monsters near the town of Shizotania, a group of knights comes across a strange surge of aer.

Yuri Lowell and Flynn Scifo are two new members fresh out of the academy of the knight division. Both are childhood friends who went separate ways, but ended up meeting each other once again while enlisting to serve the Empire.

Source: ANN

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Other: Tales of Eternia The Animation
Other: Tales of Gekijou