Monogatari Series: Off & Monster Season S01 E01 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.