The Morose Mononokean Season 1 Episode 4

When Ashiya hears that Abeno will be going to a pharmacist called the “Kiyakudo” in the Underworld, he asks to go with him. Though Abeno is reluctant to bring a human to the Underworld, he relents when the Mononokean suggests that Ashiya accompany him. Concerned for Ashiya, Abeno forbids him to travel in the Underworld alone, but Ashiya finds himself unable to keep his word again…