Night of Nights is a high-energy remix of Sakuya Izayoi's theme 'Flowering Night' from Touhou 9, created by the musical circle COOL&CREATE. It became a legendary internet anthem due to its frantic tempo and its association with Sakuya’s time-stopping, knife-throwing abilities. The track gained massive popularity in the late 2000s on Nico Nico Douga and later YouTube, often accompanied by MAD videos, rhythm game challenges like Osu!, and 'Muda Muda' JoJo references. Today, it stands as a symbol of peak internet subculture, used in memes to represent extreme speed, intensity, or the sudden arrival of a chaotic boss-level challenge.