SONO BŌKENSHA, TORIATSUKAI CHŪI. - SHŌTAI WA MUTEKI NO GEBOKU-TACHI WO SUBERU ISEKAI SAIKYŌ NO MADŌ-Ō

Proper Japanese Title: その冒険者、取り扱い注意。 ~正体は無敵の下僕たちを統べる異世界最強の魔導王~ Originally serialized in Comic Walker. — Description from Comic Vine community (comicvine.gamespot.com · https://comicvine.gamespot.com/sono-bokensha-toriatsukai-chui-shotai-wa-muteki-no/4050-126456/).