Hardest game of siblings or dating by far

Is this incest I dunno if I should read it or nah

Yes lol it’s step-siblings and they’ve known each other since they were kids

I mean, technically yes, step-siblings not related by blood. But don’t forget that the girl protagonist was isekai'd into this manga world when she died and wanted to stop the tragic end so it’s even more of a loophole considering she is a different soul as itself.