Takemitsu swords: Swords used in theatrical plays. they’re made from wood and covered in metallic foil to make them look real.
Imitation sword: Made from metal, but not sharpened and has no cutting edge.
Shirahadori: The act of catching a sword blade between the palms. Extremely dangerous.
Namu Amida Butsu: A Buddhist sutra. See https://en.wikipedia.org/wiki/Nianfo for more details.
Ohyou: Halibut. Diana is confused between sutras (okyou) and the halibut fish (ohyou).
 Knight: Knight(騎士) and the ‘Knight’ part of Magitech Knight (魔導機士) are pronounced the same way but written differently.
 A folktale about borrowing someone’s image to make yourself look more important. http://www.worldoftales.com/Asian_folktales/Chinese_Folktale_26.html
 First-class compartments on bullet trains are called ‘Green Cars’.
 The kanji (康) in Yasuo’s name, and the kanji (和) in Nodoka’s name both mean ‘peace’.