Gakkou no Kaidan

Synopsis

While searching for the internet website Yomi-net, which connects to the underworld, Leo nearly falls victim for the underworld demon hag (Datsue-ba). In the past, he used to take lost people to the boats of the Sanzu River and then force them to get into a boat and cross the river, which leads them to the underworld. His activities stopped with the installment of lights in the city, and thus he used the Yomi-net to achieve the same goal online. Satsuki and the others help Leo return by scanning him an o-fuda and telling him to wish to go back home.

(Source: Wikipedia)