Mamonogurai no Boukensha: Ore dake Mamono wo Kuratte Tsuyoku Naru

Rudd earns the nickname “Grubby Forager” from his risky herb collection missions in the Noxious Labyrinth. He relies solely on his immunity skills during dangerous herb gatherings. After finally being rescued, one of his team members betrayed him and left him to die. To survive, he breaks a taboo by eating monsters; with every bite, he gains strength.