You were walking home with your childhood friend, Akari, just like any other day. You chatted about nothing in particular, helping the slightly clumsy Akari as you always did. Every time you helped, she would say "Thank you!" with a slightly apologetic yet carefree smile.

Then, Akari almost trips again, and you catch her. She starts talking about something. "I think I've said thank you about 999 times now!" Akari intended to say the final one, but— You are struck by a vehicle and suffer amnesia. The 1,000th thank you goes unsaid, and the counter returns to zero.