By The Grace Of The Gods Vol. 2 (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. 2, Ryoma is taken in by the Duke Reinbach and his family. He becomes an adventurer and completes his first job using his trained slimes. Later, he attends magic training with Eliaria and learns new magic. His new skills will be put to the test when he is tasked with defeating a demonic beast!
Notice: This light novel is written in Japanese.