Professor Vacant and the Mysterious Mansion (Japanese: レンコン教授と不思議な館,Renkon-kyōju to Fushigi na Yakata) is the 43rd episode of the Yo-kai Watch anime series. It was broadcasted in Japan on November 7, 2014 and in the United States on October 8, 2016.
Nate, Bear, Eddie, and Katie go into the hills to do tree planting, but they can only talk about their favorite new TV show "Professor Vacant." When they find a mystery, they begin to try to solve what has happened just as Professor Vacant would. At the same time, Nate believes a Yo-kai is involved and plans to find it.
Professor Vacant is an obvious reference to the Professor Layton series, which was developed by Level-5.
The Japanese title in itself is a reference to the first game in the series, Professor Layton and the Curious Village (Japanese: レイトン教授と不思議な町,Reiton-kyōju to Fushigi na Machi). While the American English dub translates this episode's title literally, it's known in Southeast Asian regions under the title "Professor Renkon and the Curious Villa."
A tweet posted on September 2, 2014 shows the script of the episode that mostly obscured by the lines, but the title makes out to be called Professor Lenkon and the Legendary Yo-kai (Japanese: レンコン教授とレジェンド妖怪,Renkon-kyōju to Rejendo Yokai) which is likely an earlier title of the episode, posted two months before the airdate.
The Recap Time is a shot-by-shot recreation parody of an ending theme from the anime series Patalliro! called Kukku Robin Ondo.