The rule seems to apply only inside the world of the time loop.BTW why sensei doesn't have the same alliteration as his brother like all the families, Karin/Kirin, Sara/Sara, even Ami/Akira...
or better, why his brother don't have any alliteration at all (Nozomu Arawaka)? Maybe it doesn't mean anything but it's discordant![]()
Outside of it, we have Saki mother of Akira and (presumably) Nozomu, and Sekai and Nozomu parents of Ami. No consistence whatsoever
Edit: no need to verify if Nozomu is the actual father of Ami, since we know it should also apply to adoptive parents (Rika/Rin) and bridal surnames (Maki Miyamura, Sara Sakakibara, Tsubasa Tsukioka), so it's not a matter of biological links
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