* AnimeFirst: Manga adaptation by Ryou Akizuki.
* HeyItsThatVoice:
** In Japanese and English, Yayoi is [[{{Manga/Bleach}} Rukia]].
** Also, in those two languages, Ayaka is [[BurnUp Rio]].
*** In English, Ayaka is [[Anime/CodeGeass Milly]] and [[SakuraWars Ratchet]].
* Maths time: Assuming that "Hydrus Beta" is [[http://en.wikipedia.org/wiki/Beta_Hydri Beta Hydri]], it was 24.33 light years away from Earth before it went supernova. Assuming that the first shockwave was pure energy that moved at the speed of light in vacuum (and disregarding the improbability of it not dispersing per [[http://en.wikipedia.org/wiki/Inverse-square_law inverse-square law]]), the star exploded in 2142. The physical debris from the explosion hit Earth in 2356, traveling through space for around 213 years, at an average speed of around 34 thousand kilometers per second or 0.11 of the speed of light. At this speed, it takes about 35 hours to traverse the Solar system.
* RelationshipVoiceActor: This isn't the only time Creator/MichelleRuff played a character that is so good that the character played by Creator/JulieAnnTaylor attempted to challenge her [[spoiler:which almost got her killed]], and [[{{Manga/Bleach}} Rukia and Lirin are just like that]].
* WhatCouldHaveBeen: The third part of the series was intended to explain Kouta's abilities in greater detail.
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