The Time I became an Anti-Healer

Most people are fond of rpg games. In most game they desire to be powerful. In rpg and isekai LNs where the main characters are summoned in another world for helping them fight the demon lord or something. A party consists of a DPS (Attacker), a tank, a ranger and spear. Did I miss something? Ahh yes, the healer. Ryoku, A boy who is a hardcore rpg gamer despises healers. Though when he gets transported in another world, he is evaluated as a Healer. But here is the twist. He is a healer who can't heal. Well then what's his powers? How is he special? Is he strong? Well not anyone knows but secrets do unveil when they start their new life in another world!