Originally starting as a web novel before being adapted into a light novel and manga, Aneko Yusagi's The Rising of the Shield Hero follows Naofumi Iwatani, an otaku who is suddenly summoned to a parallel universe and told that he is one of four heroes chosen by legendary weapons in order to protect the world from imminent destruction.

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http://www.capsulecomputers.com.au/2015/04/the-rising-of-the-shield-hero-light-novel-and-manga-licensed-by-one-peace-books/