蛇神・撫子を騙すために、北白蛇神社に日参する貝木だが、帰り道を尾行され、さらには「この件から手を引け」と、謎の脅迫状が届き――。
Part 6 of 6. February 1st. Kaiki failed his mission because Nadeko has never trusted anyone. When she tells him that she wants to kill Suruga, he takes a desperate gamble.
