Akaten Hero!

In the high school battalion unit, Gakusei 5, Yuji Midorikawa leads a double life as the secret identity "Green." By day, he navigates the challenges of high school, but by night, he's a member of an elite team trained to protect the Earth against the invasive Galactic force, Gurdark, and its seductive queen Mayura. However, Yuji's secret is that he's not the skilled warrior he's supposed to be - he's actually quite inept in combat, often hiding behind his teammates. As he struggles to maintain his reputation as a "guardian of the Earth" while keeping up his grades, Yuji's hilarious misadventures unfold in a witty and action-packed ride.