I searching for some LN with the MC(a boy MC) stranded in a island or somewhere he as to survive and build thinks by himself like a dr.stone with only the MC our another guy with him (not a girl cause it always finish in romance ) and some fantasy world creatures(can have magic too) and need a novel that as at least 100 chapter (not a apocalyptic world with zombies and shit like dat) Good luck for my helping me
probably not exactly what you want, but you could check out Chronicles of Primordial Wars There's no romance etc. but MC isn't alone on some island. Basically MC ends up in some fantasy-ish tribal era. There's quite a bit of survival and man vs environment for 200~ chapters.