Tate no Yuusha no Nariagari, or Rise of the Shield Hero. A ridiculous, but fun anime.

Tate no Yuusha no Nariagari is one of those isekai animes where a normal Japanese boy is summoned in a magical realm to fight monsters. Once there, he realizes that the world and his character work exactly as in a fantasy video game, complete with items with upgradeable stats, waves of monsters and revealing female armor. He is summoned there with three other heroes, also from Japan, only from alternate universes, each of the heroes having their own magical item that defines their style. His item is a shield and immediately he notices that he is treated differently, with all honors given to the other three and only disgust for him. Long story short, he is forced to hone his skills through his will and efforts alone, while the others, spoiled by their environment, make no effort and therefore level up less.

I liked this anime and I will continue to watch it, although it's a bit ridiculous. I've read the manga as well, which is also new, and there are slight differences in the sense that the anime is a little more serious. If you want a mindless game like experience in anime form, go for it. Here is a trailer: