Here are a few links that wouldn't fit onto the main page:
Link to the magazine it was published in:
https://www.akitashoten.co.jp/w-champion/2016/25
Link to Fujichika Koume's Twitter post about this Oneshot:
https://x.com/hujiume/status/732965017079816193
Edit:
By the way, the localized title (The Grateful Poppo-chan) and the synopsis ARE NOT OFFICIAL. The title is in reference to the English title of the folklore and the synopsis has been written from scratch (since the "official" one doesn't tell you anything about it).