- The kanji for 空 (Sora) means sky in Japanese, but can also be read as 空 (Kara) which means emptiness, as pointed out by Shiro in during their first encounter.
- Sora and Shiro's surname was said to be "Nai" by the author. This can be interpreted that their surname is literally Nai or that they have no surname, as Nai (ない) in Japanese means none. It can also be interpreted as a joke, because when combined with their first name, Nai Sora (ない空) means "not empty" or "not Sora."
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