Yutaka Uemura

Some high-school girls have their ordinary days disrupted when a guitar-wielding misfit rolls into their lives. (imdb)

On the front lines of the war, there is a little girl. Blond hair, blue eyes, and porcelain white skin, she commands her squad with lisping voice. Her name is Tanya Degurechaff. But in reality, she is one of Japan's most elite salary men, reborn as a little girl after angering a mysterious being who calls himself God. This little girl, who prioritizes efficiency and her own career over anything else, will become the most dangerous being amongst the sorcerers of the imperial army.

Taking place 10 years after the events of FLCL Alternative, 15 year old Masaki has been seeing green ghost randomly appear ever since the steam from a mysterious building blew through his town 10 years prior.