Nito no Taidana Isekai Shoukougun: Saijaku Shoku

Hidako Masamune is a high school student who suffers from continuous bullying by his classmates. Becoming tired of it all, he decides to commit suicide, but instead he is transported to another world along with all his classmates. When they arrive, they find that they now possess amazing abilities but he was only granted the status of a "healer," the weakest skill of all. The king decides to get rid of him by transporting him to another faraway place, but not before Hidako swears revenge against the king, the kingdom, and all of his classmates.