A brief description of the manga The Healer Who Was Banished From His Party, Is, in Fact, the Strongest:
The healer is excluded from their team because the team leader realizes that he does not contribute much to the team. The healer must seek new members to form a team.
After meeting an excellent martial artist with whom he wishes to work, he reveals his secret. The main character, although a mediocre healer, is really good at hand-to-hand combat.
Anyway, here is the story of a support who is secretly a fighter. The whole conflict stems from the fact that he never told his old team that he was a fighter.