S1.E1 ∙ OROKAMONOGATARI: Tsukihi Undo

Yotsugi Ononoki infiltrates the Araragi residence to monitor Tsukihi Araragi. With Tsukihi at school, Yotsugi spends time freely until she's discovered by the unexpectedly returning Tsukihi.

The show’s own verdict is on its page.