The Tatami Time Machine Blues

In Yojouhan Time Machine Blues, the protagonist's "awful friend," Ozu, unintentionally drowns the lone remote control for the air conditioner in their flat on a hot midsummer day. A sloppy-dressed time-traveling student from 25 years in the future arrives as they are discussing their situation with the protagonist's raven-haired love interest Akashi. This prompts the protagonist to borrow his time machine in an effort to retrieve the remote control from the past before it breaks.