There are multiple artists with this name:
1) Kotodama is a dark ambient project of Japanese electronic artist Manabu Hiramoto. He is also known for the ambient project Shinkiro, although Kotodama explores a more experimental and nightmarish style, described as the perfect soundtrack for fans of J-Horror culture. Bandcamp: http://shinkiro06.bandcamp.com
2) Kotodama is a punk band from Brewster, NY, United States, featuring members of Loud Youth, EATENBYWOMBATS and Doofus.
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