Professor Renkon and the Mysterious Mansion (Professor Vacant and the Mysterious Mansion)

Keita and the others go into the hills to do a tree planting, but they can only talk about their favorite new anime Professor Renkon. When they find a mystery, they begin to try to solve what has happened just as Professor Renkon would. Meanwhile, Jibanyan and Whisper believe a Yo-Kai is involved and plan to discover it on their own.