Ichiro (played by Sadao Abe) returns to the Showa era after accidentally slipping and returns to the house where Junko (played by Yumi Kawai) and friends are waiting, as if nothing had happened.At the same time, in Reiwa, Ichiro suddenly disappears, and Nagisa (played by Nakazasa) and Akitsu (played by Hayato Isomura) are worried about his whereabouts.

Two days after Ichiro disappeared, Nagisa and Akitsu met Sakae (played by Yo Yoshida)'s ex-husband and time machine developer Masakazu Inoue (played by Hiroki Miyake) in the cafe “SCANDAL”.While listening to Inoue talk about the secrets behind the development of the time machine, Nagisa receives a smartphone call from Ichiro, who lived in the Showa era.

Inoue then starts talking about the dangers of “Time Paradox”, which is that if the past is tampered with, the future will change.

Meanwhile, Junko said she will appear on the Showa variety show.Minors must be accompanied by a guardian, so Ichiro and Sakae will accompany them to the studio.At the same time, in Reiwa, Nagisa is involved in a huge scandal that occurred in the program run by senior producer Kurita Kazuya (played by Yamamoto Hiroshi)...!?