Guest is a web writer who writes gourmet and snack-related articles.

While planning a special feature on "Nostalgic Snacks and Candy Memories" for their own web media, they received a curious email from a reader.

Prompted by that email, Guest began an independent investigation. Scouring old confectionery industry documents and Showa-era advertisements, they tracked down a defunct manufacturer formerly based in Osaka called "Yuien Confectionery Co., Ltd." and headed to the site for field research—.

This story is a work of fiction. Names, characters, places, and incidents are products of the author's imagination. Any resemblance to actual events or locales or persons, living or dead, is entirely coincidental.