Last page is haunting, perfect way to reveal a deep dark secret. I wonder what mizu will do next with this info, do an exposing vlog on them? That group might even reveal a bit of kingyo's memories.
It's a real organization within the manga.
In the bonus chapter, there's an "ad" for them, where they talk about safe food eating, but they don't exactly get into what the company is or who's apart of it just yet in Volume 1.