I wrote a video game on that exact theme actually! It’s free and it takes about five minutes to get both endings.
As for my recs:
Inso’s Law, an isekai where the protanist ends up in a world that is 99% similar to her own, save for a few differences (she has a new childhood friend, her school is different, ect.) The story spends a lot of time exploring what’s it like to be suddenly thrust in a life you have not lived yourself while everyone else is acting as if you’ve always been here- and how would someone bond with others when they have no idea when they could be yanked back to their original world at any moment.
The Fabled Warrior. Ten years after your regular isekai story, Evil rises again in the stock fantasy world, so the knights are sent to get the hero who helped them once more… only to learn that on earth, 30 years passed, the hero is now a mom with responsability, and isekaiting REALLY fucked her life up on earth so she is not eager to go back to this bullshit. The story focuses mostly on her life coming back from her isekai adventure- what do you do when you’ve been missing for almost a decade? What do you even tell people? Who would trust your crazy story?
If you’re willing to stretch a bit:
The World of Moral Reversal, an isekai where a girl ends up in a world where all gender morals are reversed, ie: girls are expected to be super horny while boys are constantly sexualized on ads. It’s mostly a comedy/satyre of gender roles, but there are also some very good moments of “this world is different from mine in a way that is both fundamental and impossible to explain and it is VERY hard for me to live here even if it supposedly puts me in a position of power.”
Mairimashita! Iruma-Kun, in which a kid got sold to a demon by his shitty parents… demon who wants him for one specific thing: to be his grandson so he can brag playing tarot with his friends. Mostly a comedy/fantasy of belonging and being loved, but it also touches on “I am the only human here and I have to hide it from everyone including my closest friends, and the fact that I have to keep such an important part of who I am a secret is kinda killing me.”
If you’re willing to stretch it a lot, watch Jumanji (1995) if you just came back after ten years locked in a fantasy world hunting to feed yourself only to learn that your family and everyone you’ve ever held dear is dead and gone would that be fucked up or what.
everyone check out my new ya fantasy novel called a court of blood, bone, ash, roses, thorns, fire, ice, stone, ravens, enemies to lovers, fake dating, two number 9s, a number 5 large, and an extra large fries
