Unexpected Healer

An okay isekai story, but heavy on the stats and the MC is too overpowered.

MC gets a buggy introduction into the system. It forces him to be a support, but his mana is bugged and became infinite. MC gets damage negation and magic negation aura's early on that combined with his infinite mana just make him immortal. The author still tries to make combat somewhat interesting, but... it nothing really matters because nothing can touch him.