Koyomi Araragi

Third season of the Monogatari Series, part 1/5. Contains the arc Yotsugi Doll from the Tsukimonogatari light novel. One day in February, Koyomi Araragi was taking a bath with his younger sister Tsukihi amidst finishing his studies for the college entrance exam. This was also following the incident involving Nadeko Sengoku, which was successfully amended behind the scenes by Deishu Kaiki. Koyomi noticed a change on his body “that could not be overlooked” and sought advice from Shinobu Oshino leading him to contact Yozuru Kagenui and Yotsugi Ononoki. Was this change signifying retribution for everything that Koyomi has done?! (Source: Aniplex)
Koyomi Araragi and Shinobu Oshino discuss the true nature of Shikigami doll Yotsugi Ononoki, and Koyomi is being rudely woken up by his sisters who tell him to cram for his upcoming college entrance exams.
Koyomi Araragi sees that he has no reflection, and discusses this with Shinobu. She then suggests that Koyomi should see Yozuru Kagenui and Yotsugi Ononoki.
When Yotsugi tells Koyomi that he is indeed becoming a vampire, Koyomi reasons that using his vampiric powers must have come with a price. Yozuru tells him that while there is no way to undo the progress of his transformation, there is a way he can stop it from progressing further: he must no longer use his powers as a vampire. However, this turns out to be quite a challenge when he learns his sisters and Suraga have been kidnapped.
Koyomi and Yotsugi land at the base of the mountain, where they are surprisingly met by Ougi Oshino. She talks with Koyomi for a while about his current situation and his upcoming confrontation with Teori. Koyomi and Yotsugi begin their journey up the mountain.