WARNING : This may or may not be a series. I just pooled it because the format was similar to each other.
Basic summary for the UNCOLORED pictures post #24195 :
Judging from what I've been reading, this story should be called something along the lines of "mass breeding disposable yukkuri". Most of the customers buy them as pet food or for torturing, some keep them as pets (the fat reimu being pushed by the vacum cleaner)