Wow, what the hell is this? I've become a ghost!

I was heading out to the mart at night, walking fast, and then—BAM! Hit by a car just like that! Is this one of those isekai things people talk about...? Like hell it is! I don't even have any lingering grudges, but I'm a ghost anyway! Am I supposed to wander the earth like this forever? Can nobody see me? Then how am I supposed to get to the afterlife...? Wait, it's already been over a month since I died?! You've gotta be kidding me, God! Even if I'm not religious, this is way too much...