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Artist's commentary
"え": Chronic Nature Lover
Pronounced as "enka no koshitsu"... A person with a strong love for nature and travels from place to place in search for natural beauty.
pixiv #30801013 »←"う" "お"→pixiv #30865706 »
Also tagged "#幻想「花鳥風月、嘯風弄月」", aka Yuuka's PoFV spelllcard [Fantasy "The Beauties of Nature"].
T/n: The original title "煙霞の痼疾/enka no koshitsu" translate directly into "chronic smoke-and-mist disease". The term "煙霞/enka", which literally means "smoke-and-mist", refers to the landscape of mountains and valleys, or natural scenery in general.