This update makes me think about Bioshock Infinite. At least, I think Sel was inspired by some ideas from it.
A lot of parallel worlds/realities.
A daughter of MC who can travel between them and has strange powers.
MC shown in grey/sepia world with a newborn baby, trying to raise her alone, heavily depressed.
Maybe in original timeline something happened with Ayane and Sensei was alone with a baby, and something happened, and he jumped (again?)
Or something sent Sensei in the past/to the different reality to prevent his mistakes?
Could be infinite (lol) possibilities. But these ideas are definitely there.
- Akira, are you afraid of god?
- No, but I'm afraid of you.