Well, as far as I had read only the scanlated chapters, there isn't a real need to read them in order, I mean, the stories are different, only Sumire is the same (and the guy, of course). I read the completely scanlated one first, but I think whatever the order you will enjoy it anyways
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This week's favorites:
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Golden Kamuiççççççç[Ô .Ô] tsutopodus© will eat your manga and steal your cats!