* AnimeFirst: Manga adaptation by Ryou Akizuki.
* KeepCirculatingTheTapes: After Creator/{{Geneon}} went under, this series has yet to re-enter print, and it doesn't help that the box sets are expensive. Though the individual [=DVDs=] can be obtained cheap.
** [[AvertedTrope Averted]] as of July 2018. Creator/DiscotekMedia announced that they have license rescued the series following Geneon's demise.
* WhatCouldHaveBeen: The third part of the series was intended to explain Kouta's abilities in greater detail.
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