I just wish she weren't a character he'd been with for like... a few days at most? Picked her up as a baby on one day and had the edo tournament on the next that lasted like one afternoon. And that's it. Even if the manga needed to end quickly - it could have been written as him winning the tournament, keeping Emi as a baby, then a written TIMESKIP for a few years showing her actually growing up as his child properly on like 4 panels, and then him being whisked away to the present to this.
This is just a bit too weak for me.