Part 1: Keita's mother makes him clean his room, and Whisper gives him the Yo-Kai Dictionary to hold his Yo-Kai Medals instead of just leaving them loose in his desk drawer. Part 2: Keita sees Fumi eat a very large hot dog bought from a nearby convenience store, and warns her it will make her fat, insulting her. He realizes her odd eating behavior must be due to a Yo-Kai. Whisper is not too sure until Keita actually finds Himo-jii, a Yo-Kai that makes people hungry, outside the convenience store. After asking him to leave, Keita ultimately calls on Bakuro-baa to get Himo-jii to reveal that he misses his granddaughter who he used to go to this particular store with. Whisper informs Himo-jii he might find his granddaughter if he would leave the store, and just as he does, his granddaughter passes by, telling a friend she misses her grandfather, but remembers the time she went to the store with him, still possessing a small toy he had bought for her. Himo-jii is moved to tears and Keita gets his Yo-Kai Medal. However, Fumi is still mad at Keita for calling her fat. Part 3: Everyone in class seems to have forgotten things at home, including the teacher who is still in his pajamas. Whisper believes a Yo-Kai is causing problems, and Keita scans his teacher to find he is possessed by the Yo-Kai Wasuren-bō, a Yo-Kai that makes people forgetful. Wasuren-bō decides to get on Keita's good side by making Fumi forget he called her fat and making the teacher forget to give them a test, but Whisper tells him he should not use Wasuren-bō selfishly. Wasuren-bō eveals his past and how he wants revenge for being forgotten, attacking Keita who accidentally calls on Jinmen-ken, having left Jibanyan's Yo-Kai Medal at home, who defeats Wasuren-bō because Jinmen-ken's head tastes bad to Wasuren-bō. Keita promises that he will take care of Wasuren-bō as his friend, gaining his trust and Yo-Kai Medal. In joy, Wasuren-bō lands on Keita's head, only to accidentally make Keita forget everything that has happened. Part 4: Keita and Whisper see Jinmen-ken has opened a high class hair salon called Gin Men Ken. When they see him the next day, Jinmen-ken is distressed because his only clients have been dogs, and Whisper discovers it is because of a bad advertisement. After Whisper reads another ad about a fashion shoot needing a cameraman, Jinmen-ken gets a new idea.