By The Grace Of The Gods Vol. 6 (Light Novel)

Ryoma Takebayashi is a lonely office worker who lived an uneventful life and died one night in his sleep. In the afterlife, he is met by three gods who decide to reincarnate him into another world filled with fantasy and magic as an 8-year-old boy. There, he’ll learn to make friends, learn and hone his abilities, and, maybe together with a little help from the gods, learn how to live an eventful, happy life in this fantasy slice-of-life light novel by Roy and Ririnra.
In Vol. 6, Ryoma is invited by the head of the Adventurer’s Guild to instruct a training course for new adventurers. Later, he tames a new kind of slime and makes a revolutionary discovery!
Notice: This light novel is written in Japanese.