After his classmate and crush is diagnosed with a pancreatic disease, an average high schooler sets out to make the most of her final days.

Akino is a trainee concierge at the Arctic Department Store, an unusual department store that caters exclusively to animals. Under the watchful eyes of the floor manager and senior concierges, Akino runs around to fulfill the wishes of customers with a myriad of needs and problems in her pursuit to become a full-fledged concierge.

It is August 12th. After the remote control to his boarding house's only air conditioning unit is inadvertently destroyed by spilled cola, "I" devises a plan to return to yesterday in a time machine to recover the remote before it breaks. However, his prankster friend Ozu cannot resist playing with past events, even if it means bringing the universe to the brink of destruction. Now "I" finds himself racing through time to avoid disaster.