Guardian Reincarnation: The Matter of My Entire Life Being One Big Misunderstanding

The protagonist Masaru is tasked with a divine quest in heaven and transfers to another world as a guardian spirit. The baby he meets in the transfer destination is in mortal danger. Can Masaru clear the divine quest as a guardian spirit? What is the reward for the divine quest? And this is a tale of adventure in another world, beginning with the revelation of the protagonist's misunderstanding—he had thought in his previous life that he had "obtained everything"—as he encounters new people and forges new bonds.