Part 1: After being released from prison, again, Jinmen-ken decides to try to become a pastry chef to be surrounded by women. But in his apprenticeship his canine side gets the best of him and he is carted away to jail, once more. Part 2: Keita's class plans a park clean up, and no one is that invested in it, until Keita suddenly gets fired up. Keita's friends are weirded out by his behavior, and when Whisper shows up to check on them he discovers a Yo-Kai to be to blame, soon taking over Kanchi in place of Keita, allowing Keita to identify the Yo-Kai as Melamelion, a Yo-Kai that makes people want to win at anything. Keita calls on Himo-jii to talk to him to figure out his goals, and they manage to convince Melamelion to free Kanchi, but he soon takes over Fumi. Keita then calls on Honobōno to calm Fumi down, as well as Melamelion, befriending him. Part 3: Keita wakes up with a sore tooth, so his mother signs him up for a dentist appointment to check it out. He is a little afraid, but Kuma and Kanchi convince him the local dentist is a nice guy. When he goes for the appointment, the dentist seems scared of him, and upset. Keita realizes it must be a Yo-Kai, so he scans with his watch and, with Whisper appearing, discovers that Negativoon is the culprit, a Yo-Kai that makes people depressed. As the dentist goes deeper into depression, Keita calls on Melamelion to negate Negativoon's affect on the dentist, driving him away, but making the dentist too eager to treat Keita's sore tooth. Part 4: Keita and his friends have a sleepover, and after Keita convinces his mom to set up some futons in the living room for them to spend the night. Kanchi reveals he has the remote for the television so they can stay up all night watching shows they would not otherwise be allowed to. After Keita's parents go to sleep, the boys watch TV. Whisper reveals this fact to Jibanyan, mentioning that they are going to watch a NyaKB nighttime special, making Jibanyan want to join in. As they watch the special, the channel begins to change on them. Whisper pulls Keita aside, revealing a Yo-Kai is causing this, revealing Denpaku-kozō. Keita prepares to call on a Yo-Kai to get rid of him when Jibanyan steps forward to take care of Denpaku-kozō on his own, but Denpaku-kozō's electrical powers are stronger than Jibanyan. When Jibanyan chases after him with a vacuum cleaner, waking up Keita's parents, and Denpaku-kozō escapes. The boys decide to go to sleep, but Keita wonders where Whisper has gone, as he complains about being stuck in the vacuum cleaner.