Title:

卵 (tamago)
egg

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This is a top in the shape of an egg. When it is spun very hard, it stands up on its tip like a hard-boiled egg.

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Hiroi Michiaki: This is… what is this? Ah, this is that thing that, if you spin it hard, it stands up. There’s not really a name for it, but you do this and spin it sharply, and it stands in the same way a boiled egg stands up.