Ep. 1: Koyomi and Shinobu discuss Yotsugi Ononoki's nature before Valentine's Day arrives.

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Koyomi Araragi and Shinobu Oshino debate whether Yotsugi Ononoki is an apparition suited for human life, with Shinobu arguing her humanity stems from interaction needs rather than desire. Koyomi reflects that apparitions exist because people believe in them, foreshadowing the series' end. The narrative shifts to Koyomi waking to his sisters, Karen and Tsukihi Araragi. Karen urges him to focus on upcoming college entrance exams rather than Valentine's Day, leaving him to prepare a bath. Koyomi and Tsukihi discuss Karen's dedication to karate and the Fire Sisters, acknowledging her need for independence. After a brief argument, the siblings share the bath. Tsukihi mentions Nadeko Sengoku's hospital release, prompting Koyomi to resolve to balance spiritual energy in the town before leaving for college. He worries about his burden, but Tsukihi advises against excessive stress. The scene ends with Koyomi noticing his reflection is missing in the mirror, hinting at his vampire nature.