The Strongest Tank's Labyrinth Raids

Rud, a shielder with a defense stat of 9999, serves as a tank for the Hero's Party as they carry out raids in labyrinths. When the tyrannical hero suddenly kicks him out of the party, saying his skill is useless, Rud makes his way back to his hometown. Along the way, he saves a young girl, and she reveals the true nature of his skill... which turns out to be incredibly powerful!