I watched a short animation "Transformed Boy" some time ago, which is about two young private detectives, a man and a woman, sharing the same body. I thought it was quite interesting, and I was thinking about some SEED fans, but I didn't really imagine it would follow the original route as completely as the previous one, so I put these two settings together.
Wow, so the personalities of the two protagonists are different from the original SEED.
Not time travel.