This animation belongs to MolingXingKong, he has agreed that I can re-publish any of his BiliBili videos onto YouTube, therefore I have his permission; do not consider me as the animator.
I fucked my test
Original Video:
（60fps动画）巅峰技术力！超燃？undertale last breath phase3完整版！最后的呼吸第三阶段 https://b23.tv/WmioBk8
By MolingXingKong
Thumbnail and Video given by Seldron333
https://youtube.com/c/Seldron333
I finally found the song:
https://on.soundcloud.com/doQde