Kinki no shujū keiyaku ~ tensei reijō wa otōto no to ai ni honrō sa reru ~ (Associated Names)

On a certain day, I was confessed to by my younger twin brother. “I’ve liked you since long ago. I want you to break up with your boyfriend and choose me.” However, just after receiving the surprise confession, we were both caught up into an accident and our short lives came to an end… Or…