The first book in the Demon Princess Magical Chaos series (The Tentacle Awakens) resembles both Kumodesuga and Neta Character Tensei. The protagonist is sort of like the former’s (which is good) while her ‘main’ love interest is sort of like the latter’s (which is bad).
Awkward/creepy sexual elements aside though the book’s main issues are how erratic the protagonist’s personality is and incredibly contrived the event developments are. It requires some significant suspension of disbelief to get into, and doesn’t really have any noteworthy traits to justify that investment.
Ningen Fushin no Boukensha-tachi ga Sekai o Sukuu Youdesu (English subtitle: The Ultimate Party Is Born) meanwhile resembles Grimgar a bit in setting and characters, although it’s much more irreverent and not an isekai story. That second part ends up important as a result of the inexplicable modern-day idol industry subplot. Why was that included? Are reincarnations/isekai’d travelers going be introduced down the line? Just bizarre.
Apart from the ill-fitting idol elements the only other complaint I can really level is that the protagonists’ backstories are a bit too melodramatic. It really hammers home how unjustifiably screwed they all were almost to the point of parody… which may have been the point. Guess we’ll see how the upcoming second novel goes.