Ghost Stories/Gakkou no Kaidan (Dubbed) S1/E19

The ghost of a feared motorcycle punk (首なしライダー, ) who lost his head years ago in a road accident goes on a rampage decapitating everything that resembles a head every year, on the anniversary of his death. Satsuki and the group learn that the only way to seal him is by offering him a "new head" (or most likely a fake head) near a light and water. Satsuki tries the remedy, but learns that he is too powerful and dangerous to be defeated. Fortunately, the biker cannot attack anyone who is using a scarf, because the neck is hidden. When he sees that Satsuki and the others' have scarves wrapped around their neck, he spares them and returns to the spirit world. Also, the ghost's attack is restricted to the twenty-four hours of the day of his death's anniversary, as he was about to decapitate Satsuki when the town hall's nearby clock struck the midnight hour, forcing him to spare Satsuki's life and return to the Spirit World.