Well, it's partly because a oneshot needs a single good idea where a serialization needs consistent good ideas or it will stretch its one idea until it's not good anymore.Why is it when it's a good one they only do oneshots WE GOTTA FUND THESE AUTHORS
Sure 'nuff. Most likely it's from China. Second most likely she reimported it back to Japan.Most unbelievable thing in this manga: "Made in USA" on the trinket.