Why does it seem like every Isekai turns into a harem anime? Even ones that don't focus on relationships seem to fall into it, like Shield Hero or Konosuba.

I'm tired of oblivious, nerdy boy surrounded by hot women.

Is there a single one out there where it's just about the journey/world/platonic friendships, and not about "oooh the main character fell on top of one of his companions again and his face is now in her boobies/crotch!" levels of ecchiness?