Tensei Kenja no Isekai Life: Dai-2 no Shokugyou wo Ete, Sekai Saikyou ni Narimashita

Sano Yuuji works at a company that is harsh on its employees. After bringing some overtime work back home, he gets a message on his computer: "You have been summoned to an alternate world!" It is a game-like world, complete with status bars and skills. Yuuji tames a slime monster and thus becomes a tamer. Then, he suddenly attains a second profession — sage — and awakens magical powers within himself. Yuuji's alternate world adventure begins when he follows a slime, that seemingly weakest of all monsters. (Source: Anime News Network)