This Ugly Yet Beautiful World

Summary: 

    Takeru and Ryo are two highschool students who work doing deliveries for the former's uncle. One night, the two go to investigate a mysterious light in the woods only to find a young girl. Takeru and Ryo are promptly attacked by a strange alien monster, which is defeated when Takeru unknowingly transforms into a powerful and strange looking beast himself. The girl, who the boys name "Hikari" (light), is taken in by Takeru when she confess to having no memory of who she is.

They are later joined by: Jennifer Portman, an American scientist with an interest in the boys and Hikari; Ioneos, a shape-shifting robot loyal to Hikari; Kuon, a little floating alien; and Akari, Hikari's "sister". The series follows the daily lives of its characters as they learn about the human condition and face the incoming monsters.