By the Grace of the Gods Vol. 4 (manga)

Reincarnated as a child in another world, middle-aged Japanese office worker Ryoma Takebayashi is living life to the fullest in the realm of Seilfall and testing his skills in unexpected ways. As his slimy experiments in monster taming take a new turn and monster hunting quests from the Guild fill up his schedule, Ryoma isn’t wasting a minute of his second chance at life in this latest volume!