Despite being initially interesting, the story overall suffered from some plotholes, writing and grammar. First of all, the major plothole that came was how initially it was portrayed that Rei couldn't simply go back to Granblue due to the portals closing but then its eventually revealed that he can actually just open it and go. What was the whole point of it then and even the very concept of the title and the story. Him being stuck in a world could have been fine if opening a portal took a lot of energy and he couldn't actually control where it was connected thus giving a valid reason on why he would remain in the current world he is stuck in. Having a problem that actually wasn't a problem and just him being their for reasons just made the story overall confusing. The story itself suffers from the problems in the original story: Rei still being bland and not overall interesting to read. Forced Harem with characters being in different situations in the Canon for the sake of being with Rei such as Grayfia. The whole situation with Saber was good but then suddenly her being with Rei felt so forced. Pacing combined with the plotholes just makes it worst.
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yea I'm still not don't know how to do pace properly, and opening portal doesn't take a lot of energy except if he's using it to go to different world he can just forcefully break it like what Djeeta did but there is some consequences that gonna show up later chapter when rei is back to dxd
