【雪歌ユフ】ブラックボックス【UTAU cover】+UST

hello! original: 荻凪裕作 https://youtu.be/I96195IG-jc?si=vmdPNneU7I9CvNRE ust: https://bowlroll.net/file/342258 more usts: https://pifuyuuust.blogspot.com/ thank you!