Official upload: https://www.pixiv.net/en/artworks/95379382
The artist included a description in English:
"While on a wandering journey to help others, the shipwrecked Odile heard of a monster called the "Mist" in a certain place. Once he saw the mist, death would come in an instant. It's called a monster, but we don't even know if it's a curse or something physical. The red mist that appears is truly a mist of blood... It is said that none of the Pokémon survived the scene.
Audile couldn't turn a blind eye, so he went in alone. What he saw there was literally unbelievable...and he didn't want to believe it...
This is the first part of the story that connects the three years leading up to Audile's reunion with Fushigiwusa.
This is the first part of a story that connects the three years until Odile's reunion with Fushigiwou. *It has been more than five years since it was published, so I'm posting it on pixiv. *Please note that there are many deaths and missing scenes."