二酸化炭素はCO215,351 Views SingersKotonoha Akane (VOICEROID)Other Voice SynthesizerKotonoha Aoi (VOICEROID)Other Voice SynthesizerProducersemicolonProducerViews BreakdownNiconico9.8K ViewsYouTube5.6K ViewsDaily Views311/16311/17011/18311/19411/20111/21211/22VideorefreshRefresh Song DataListenYouTubeNiconicoVocaDB