The Kiyojūji Paranormal Investigation Squad is on a train to Mt. Nejireme and they discuss a legend they're going to hear a professor tell them when they arrive. They pass the time playing Youkai Poker to help them learn more about youkai, with Rikuo always winning, to Tsurara's admiration. Kana notices Tsurara staring at Rikuo and it appears to annoy her. Back at the station, Aotabō is angry at Yuki Onna for leaving him behind, and he sets off after the train.
The kids arrive at Mt. Nejireme and they set off for Umewakamaru Shrine to meet the professor. After climbing the mountain path for a while they spot a shrine, and Rikuo is able to read the sign even though it's too far away for the others. Professor Adashibara greets them there and explains the legend of the mountain. The legend is that a young man by the name of Umewakamaru was travelling through the mountain to search for his mother when he was mortally injured a youkai. His regret at not finding his mother led Umewakamaru to change into an oni that would attack anyone who got lost on the mountain. The shrine they met at is on of many built to placate him. The girls remark that the legend sounds pretty much like a generic youkai legend, so Adashibara tells them to come see something. Tsurara asks Rikuo if he knows any youkai called Umewakamaru, and Rikuosays that he thinks this place is dangerous. Adashibara shows them a giant claw in a tree, freaking out Shima, Natsumi, and Saori.