Souten no Graiger

Yuuya Tenkase was a 2nd year student at Silverstar Private Academy.
He was wasting his days of youth when before him appeared a hero from another word.

That hero was a Graiger, who bestowed the transformative Graiger power to Yuuya.
Where unknown enemies lurked, Yuuya's body would instinctively enter fighting form.

[from DLsite English]