as they step back one day, they run into problems beyond their control. While Ishimatsu, Niimi and Koizumi go back in time to retrieve the remote. The strange guy is revealed to be Tamura who is a member of the sci-fi 25 years in the future. Tamura gets sent to the past the same way Soga was coerced onto the machine. The remaining members, Haruka, Soga, Ito, and Komoto take Tamura on a tour of the past. While on the tour they encounter their club adviser, Professor Kohtaro Hozumi, referred to as Hose, who explains that changing the past results in the grandfather paradox and would cause the universe to vanish. Realizing this the remaining club members rush back to ensure that the Ishimatsu, Niimi, and Koizumi do not change the past. Ishimatsu and Koizumi get sent back to the present but they return shortly with Tamura after being informed about the situation. They find the time machine waiting for them when they get back to the club room. Soga and Takuma go to the past and prevent the trio from changing the past. In the process Soga wraps the remote in tape and gets transported to 99 years into the past to prevent the caretaker from discovering the time machine. The school being originally a swamp, Soga almost drowns before returning to the present. The past villagers mistaken him as a Kappa and Kappas becomes integral to the town culture. Soga also loses the remote 99 years in the past. Komoto finds Niimi at the bathhouse and in a twist it is revealed that Niimi himself took the shampoo. With the remote missing Tamura goes into his future to retrieve the future's remote so that the past won't be altered. Everyone gets on the time machine but the machine is too small and Komoto gets knocked off. Komoto deceives the past club members who mistakenly believe that he has a girlfriend due to a voice message Komoto sent to the "present Soga" which "past Soga" received. Komoto distracts the club members but before he can leave his past self enters the club room. With no other options Komoto hides in the club room locker. The present club members return and notice that Komoto is not with them, but Komoto is already in the present having spent the whole day in the locker. A dog digs up a remote which