Ozu, a despicable prankster, spills cola on the remote control to the dorm's only air conditioner.

"I" and friends team up to use a time machine to retrieve the AC remote control before it breaks.

Akashi and "I" travel back in time to restore order to the universe but run into unexpected trouble.

Akashi has a plan, and "I" catches on. Can they escape the maddening cycle of one-day time travel?

As a university freshman, "I" joins a club dedicated to fantasizing about a fictional railway.