Tbh this isn't that bad, sure there was the whole killing school friends thing, but I've seen worse (sadly). Still though, if that goddess knew about most of his life story, then why did she not figure out that the sister did all that stuff, and that he hated her for it, and that his reason of death was basically because of his sister?! I hope the goddess fixes this at least somewhat, that or the MC figures something out to help the issue. I can't really see him tolerating any kind of life with her, so getting her mental help/support isn't really one of his options. Looking forward to more chapters, I couldn't notice any issues with the translation or other jobs, so great work on the scan Paen/Ecchi Brothers!
Edit: Then again, the goddess did seem to panic when the MC went nuts at the realization of her reincarnation, so she likely noticed her mistake, and if I recall correctly, the goddess did say in a way that she was going to attempt to protect him and she did tell him that he needed to run. So if anything, the MC will quite likely get some help from Ms Goddess in the future.