Nadeko Snake, Part One. Koyomi and Suruga travel to an abandoned shrine to place a talisman at Oshino's request. As they climb the mountain the shrine is located on, they pass a girl running down the path, who exchanges only brief glances before continuing in the other direction. Once they reach the shrine, Koyomi and Suruga discover a number of dismembered snake corpses in what appears to be some sort of ritual. They both quickly decide to leave. The next day, Tsubasa accompanies Koyomi to a bookstore to help him pick some study guides. Tsubasa warns Koyomi that his being kind to everyone, and Suruga in particular, may well put his relationship with Hitagi at risk, if he doesn't begin to set boundaries. He is surprised to learn she intends to travel the world instead of attending college after graduating. She leaves after getting a sudden headache. Koyomi then meets the girl again, who he finally realizes is Nadeko Sengoku, a friend of his sisters whom he met as a child. He and Suruga intercept her at the shrine, and return to Koyomi's house. Once there, Nadeko takes off her clothes, revealing snake scale-like marks on her skin, and pleads for Koyomi to save her.