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It's just time working in odd ways, here. Just like how Yuuki's daughter is present.
[Granted, compared to Ai being fifteen, Ren is nearing (if not beyond) one thousand years old.
He seems a little amused; ]
The only one left with looks similar to mine would be my father. Then there's Yuuki, Ai, and Haruka who all appear alike. There are other looks back home, though. Or course there are.