A known image of Iwakasa in Cage in Lunatic Runagate
Subordinate of the Emperor
Iwakasa (岩笠) was an enigmatic character who only thus far appeared on Chapter 4 of Cage in Lunatic Runagate as Fujiwara no Mokou reminisces to Keine Kamishirasawa about her past. He was apparently murdered by Mokou in order for her to obtain the Hourai Elixir so she can one day have her revenge against Kaguya Houraisan.
In Cage in Lunatic Runagate, Iwakasa is seen only from behind and shadows further obstruct view, but he appears to wear robes and have his hair in a martial ponytail. He is apparently based on the character Tsuki no Iwakasa, from the original Tale of the Bamboo Cutter.
Around 1300 years ago, he was a subordinate of the Emperor who was ordered to dispose of the Hourai Elixir. He meets Mokou on the way up Mount Fuji, and at the top, they meet Konohana-Sakuyahime, who tells them not to throw the elixir into the volcano, lest it become active and unstoppable even with her power. He tells them to dispose of the elixir on a different mountain. On the way to the specified mountain, Mokou sends Iwakasa tumbling down a hill and steals the elixir. It is unknown what happened to Iwakasa after that.
Fujiwara no Mokou
Iwakasa was murdered by Fujiwara no Mokou in order for her to steal the Hourai Elixir and become immortal. She notes that one day, she wants to travel to the top of the Youkai Mountain, presumably to see Iwanagahime, the goddess of immortality, and to apologise to her for what she did to Iwakasa. (NB: The Youkai Mountain was once the mountain Yatsugatake, which is the mountain Konohana-Sakuyahime suggested to Mokou and Iwakasa to bring the elixir to instead.) In the fourth chapter of Cage in Lunatic Runagate, it's shown that her immortality was derived indirectly from Iwakasa as well, as he saved her life prior to her immortality. Mokou feels guilt for having disposed of him just for the sake of her revenge against Kaguya. Two of her spell cards (Limiting Edict "Curse of Tsuki-no-Iwakasa" and Forgiveness "Honest Man's Death") are named after him.
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