S1·E101 The Demon Who Became a Rock / Octopuses Don`t Have Bones / Ryuuguu Abyss

A demon and his son live in the mountains. The princess of Ryuuguu castle has a baby. Taikichi, who always gives an offering to the Ryuuguu Abyss, is given a wife and child by Ryuuguu Palace. Source: crunchyroll