Ayano's Theory of Happiness15,686,716 Views SingerIAVocaloidProducersJINProducerZukioProducerNakanishi RyousukeProducerViews BreakdownYouTube12M ViewsNiconico3.1M ViewsYouTube231K ViewsDaily Views2.9K9/292.8K9/302.7K10/014.8K10/023.4K10/031.5K10/042.5K10/05VideorefreshRefresh Song DataListenYouTubeNiconicoVocaDB