That was me I immediately started thinking it after we started to get to know Stella's personality because well if you look closely she totally acts like OrikoOk I am also jumping on the sister theory bandwagon.
They are totally parallel world sisters like some previous commentators have said.
I would've been thankful."Why me too?"
You literally sat on him
I just hope it doesn't try and start a big overarching plotline at the end like so many other slice-of-life manga have. Just feed these plot bits to us in pieces and maybe dedicate 2 or 3 chapters to resolving whatever conflict without overcomplicating everything all in one go....I hope this doesnt end up with Oriko's mother being an alternate universe version of her. I don't like my family trees looking like a circle.
Also big fan of Gimlet and Sebastian. It's funny how Sebas' personality changed from the earlier chapters(saying lololol, etc). I prefer him as he is now.