Its a little fuzzy but what i remeber was the mc got in an accident when he was going somewhere to like a town with his sister and due to his injury he had to get his brain transplanted into another body that was female but he was unable to consent to the surgery himself so his sister consented to the surgery on his behalf and he and his sister had to get to a apartment somewhere and it its style of the characters are like a anime to 3d or something i cant fucking remember the name please find it if you can and anything very close to what i described