Marichas greetig each other are adorable :D
Is this an intentional outdoor colony or farm for flan food of some sort?
The Flan is his sister's pet she picked up with a dying mother Flan who probably encountered abyuser human.
The little Reimu is part of a House Yu family living in Miss' home. But they get along when stray yukkuri break into their house and Mister (who is asked to clean up her House Yu problem), found them making more mess for him to clean.
This yukkuri colony Mister made to observe averagely nice yukkuri by letting them live in his backyard with minimal interference from human.The yukkuri (starting from ex-abyused Marisa) know to not be scum against human, and they just live like yukkuri with what they have.
I can't wait to read this all when it's translated.