Land of the Lustrous - Wikipedia

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Bort, Wiki

Land of the Lustrous: The Lustrous / Characters - TV Tropes

The Disappearance of Haruhi Suzumiya - Wikipedia

Land of the Lustrous (TV series) - Wikipedia

I started to read Sakuhinshuu the other manga of ichikawa and found this. (Check the wiki for Kannon there are at least 10 differents evidences that makes it looks like it's Phos)

The Decagon House Murders (manga) - Wikipedia

Urusei Yatsura (1981 TV series) - Wikipedia

Maaya Uchida - Wikipedia

Cinnabar, Houseki no Kuni Wiki

Lapis Lazuli, Houseki no Kuni Wiki