二酸化炭素はCO215,243 Views SingersKotonoha Akane (VOICEROID)Other Voice SynthesizerKotonoha Aoi (VOICEROID)Other Voice SynthesizerProducersemicolonProducerViews BreakdownNiconico9.7K ViewsYouTube5.5K ViewsDaily Views011/01211/02211/03111/04211/05311/06211/07VideorefreshRefresh Song DataListenYouTubeNiconicoVocaDB