二酸化炭素はCO215,602 Views SingersKotonoha Akane (VOICEROID)Other Voice SynthesizerKotonoha Aoi (VOICEROID)Other Voice SynthesizerProducersemicolonProducerViews BreakdownNiconico9.8K ViewsYouTube5.8K ViewsDaily Views2312/18012/19812/20112/21112/22112/23612/24VideorefreshRefresh Song DataListenYouTubeNiconicoVocaDB