REBORN! Season 1 Episode 5 The Head Prefect's Amusement

The prefects have immense power in Namimoi Middle School, the school that Tsuna attends. School council leader and head prefect Kyoya Hibari is the leader of the delinquents, and mercilessly attacks anyone who is weak. Reborn takes note of Hibari's strength, and when he learns that only prefects are allowed in the reception room, Reborn knocks Tsuna out, which leads to Gokudera and Yamamoto taking Tsuna into the reception room