<https://www.hoshi-suna.net/archive/category/%E3%83%8D%E3%83%83%E3%83%88%E6%96%87%E5%BA%AB%E6%98%9F%E3%81%AE%E7%A0%82>
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"ネット文庫星の砂"
<https://www.hoshi-suna.net/entry/kotoro_kotoro>