Imperfect hero - Greko Nankin

Yuji Midorikawa is a typical high school student who has a secret identity: he is 'Green' in the high school battalion unit, Gakusei 5 (G5 for short). G5 is the special unit trained to fight and protect Earth against the invasion of the dreaded Galactic force Gurdak and its sexy queen Mayura. But Green has a problem. He really can't fight and always ends up hiding behind his team mates. What ensues is a witty and wild ride as the Imperfect Hero struggles to maintain his reputation as a guardian of the earth while keeping up his grade point average in school!