Watch Saikyou Tank no Meikyuu Kouryaku: Tairyoku 9999 no Rare Skill-mochi Tank, Yuusha Party wo Tsuihou sareru

Rud is a tank of the Hero's Party and is said to have the highest defense ever in history. The party often does labyrinth raids, but to Rud, it means more than just a raid. To cure his beloved sister's illness, he is in search for the wish-granting treasure that might be hidden in those labyrinths. But one day, the arrogant hero kicks him from the party after an unsuccessful raid attempt, blaming it on his skills whose effects he is still unaware of.