Sighborg Y Episode 4: Isolated (Japanese: アンドロイド山田 第三話 鉄槌,Andoroido Yamada Dai-San-Wa Tettsui), Hapyon Detective Agency: Case File 9: Daiz (Japanese: イナウサ不思議探偵社 調査ファイル9『ボー坊』,InaUsa Fushigi Tanteisha Chōsa Fairu 9 "“Bōbō”"), and Yo-kai Demandi (Japanese: 妖怪無茶ぶりっ子,Yōkai Muchaburikko) is the 128th episode of the Yo-kai Watch anime series. It was broadcasted in Japan on July 8, 2016 and the C-Part aired in the United States on December 15, 2018.
Sighborg Y gets a feeling of depression as he watches his family and the others have fun without him. Rinsin Repete ask Hailey and Usapyon for their help on finding Daiz. Katie makes her classmates do difficult dares when she gets inspirited by Yo-kai Demandi.
Whisper's theory of Daiz being created in a sausage factory in Yo-kai Daiz was proven true in this episode.
The disclaimer of the sausage factory may contradict what Daiz's original appearance as a human was like as it was a reimagining rather than what actually happened.
It is revealed that Daiz lives in a pet shop and sleeps cuddled up with a bunch of hamsters.
It is also revealed that the reason why Daiz has a seethed hatred for sausages so much was because back when he was human he was the best inspector back at the ham company he worked at. One day the rival sausage company next door bought their company and made him inspect sausages instead. His hatred for sausage started from that point on and followed him up until his transformation to a Yo-kai.
Errors
Hailey was able to see Rinsin Repete without using her Yo-kai Watch beforehand.