One Punch Man began as a webcomic by ONE before becoming a popular manga and anime series, with its first anime season airing in 2015. The story follows Saitama, an overwhelmingly powerful hero who often feels bored and isolated because no opponent can challenge him. That contrast between immense strength and quiet loneliness made its slower, sadder music a natural fit for fan edits. Clips of the theme spread through anime tribute videos and short-form edits, where creators reuse it to underline loss, sacrifice or a lonely ending, keeping it popular long after the episodes first aired.