ch61 - on my initial read, I really disliked the hero and was put off by him taking on a slave, but on second read, I kinda see his redeeming points.
MC summoned to other world as shield hero, framed by royal family and ostracised, he buys a slave demi human to fight for him, constantly persecuted by the 3 hero church, finally manage to clear his name when the queen returns, but still the 4 heroes unable to get along or share information. During the 'wave', he meets other humans from another world, seeking to kill the heroes in this world for the survival of their own. Now fighting giant turtle, controlled by an enemy hero.
Tate no Yuusha no Nariagari