Campione!
カンピオーネ!〜まつろわぬ神々と神殺しの魔王〜 (original)
Godo Kusanagi, a high school student that kills a god, claiming its power and title of Campione, to slay other gods.
Starring Eri Kitamura, Sachika Misawa, Rina Hidaka, Yuka Saitou, Yui Ogura, Nobutoshi Canna, Junko Minagawa, Takuya Eguchi, Yuiko Tatsumi, Yoko Hikasa
Watch "Campione!" on Amazon released in 2012. It's a comedy and action & adventure show, and has a rating of 6.8 out of 10 from Imdb which is usually fine for this kind of show.