World Teacher: Isekaishiki Kyouiku Agent

A highly skilled special agent, he dies while attempting to save his team but is reborn as a young boy in another world. In his past life, he had not completed a mission to train a successor. Determined to fulfill this goal, he seeks out individuals in the new world to mentor. He aims to pass on his knowledge and experience, hoping to shape them into capable successors. His journey focuses on identifying and guiding those he believes are worthy of his teachings.