I just made an acc to comment on this short webseries.
It's weirdly interesting without even having a clear focus point, a clear message or a clear anything actually.
The art is just awesome, i absolutely LOVE this style. But despite not having anything that clear in it's story or it's art, it still is interesting, you (at least i) still want to read it and continue, i don't really get or know why, it's very intriguing.
I'd recommend to read this as it takes no longer than an hour or so, i really enjoyed it despite not getting a clear message at the end, all i can think is the same thing as the people commenting here : Pointless and vain.
Mission-chan is pointless and vain, and that is what makes it very good and unique.