the rising of the ultimate hero (rising of the shield hero harem x male oc)

Toad Skywalker is just a normal guy with normal problems. He recently found out that his girlfriend cheated on him and he's been cold hearted ever since. One day, he went to the library and found a very unusual book. When he opened it, he was transported to a new world where he was appointed as the "shield hero ". But as soon as he got to the new world, he was treated as a pariah. This made him even more irritable at one point, he rescued a demihuman by the name of Raphtalia, she became eternally grateful and decided to be his wife. Other girls has fallen for him too so now he has a harem.