The Rising of the Shield Hero Vol 1

The Rising of the Shield Hero Vol 1 by Aneko Yusagi. A Fantasy manga rated Older Teen, published in English by Tokyopop in 2015.

Naofumi Iwatani is summoned to another world as one of four legendary heroes, but as the Shield Hero he can't attack, and he's soon framed and betrayed by the kingdom that called him. With Raphtalia, a raccoon-girl he frees from slavery, he fights his way back from rock bottom. The manga adaptation of the hit light novels.