Most of the isekai stories involving more than a few people are 'hero' summoning or god 'you're about to die, so I transferred you' summonings, and they're not necessarily reincarnated
something eomething magic otaku burikko ...... i cant remember the name but it was translated by onichanyamette
Eh.... Try these: So What If It’s an RPG World? I Appear to have been Reincarnated as a Love Interest in an Otome Game
How much is "many"? Demon Girl ~Tale of a Lax Demon~ - Has 3 people so far confirmed to be reincarnated. Fluffy