Number One is a well-known soundtrack cue from Bleach, the anime adaptation of Tite Kubo's manga, with music composed by Shiro Sagisu. It became closely associated with Ichigo Kurosaki and big turning-point scenes, which helped it stick in fan memory long after its first TV run in the 2000s. Online, the track spread through anime edits, matchup videos and ironic hype posts because its opening instantly signals confidence, pressure and a main-character moment.