Why it worked
The video leverages popular characters from a well-known anime (Demon Slayer) and taps into fan engagement by discussing character rankings, a common topic within fandoms. The direct assertion of Gyomei's strength creates a strong, albeit subjective, statement that can provoke discussion and shares.
Summary
The video displays various characters from Demon Slayer, with on-screen text discussing Hashira rankings and proclaiming Gyomei as the strongest. It appears to be a fan-made compilation or discussion piece.