Later, as Koyomi is about to plan something mischievous to Mayoi, Shinobu wakes up to punch Koyomi away and demands an explanation after she felt some unease from Koyomi's recent experience, including being chased by 'darkness' and being kissed by Yotsugi. With Yotsugi returning to work, Koyomi decides to thank her for her help, with Koyomi repaying the deed by being kissed by Yotsugi. Without the proper knowledge about their latest threat, Koyomi chooses to wait until evening where Shinobu can be active and to ask Tsubasa about anything she could know about the 'darkness'. Koyomi is no oddity specialist to pinpoint it, and Yotsugi implies that it would be easier to deal with it if it was simply 'darkness'. Picking up the two and making a big leap, they quickly reach the Eikou Cram School building.ДЄs Mayoi rests, Koyomi and Yotsugi try to determine the entity that has been pursuing them. Although Yotsugi fails to understand their current dilemma, she agrees to help Koyomi and the now unconscious Mayoi escape. Eventually, the 'darkness' consumes their bike, just as Yotsugi Ononoki discovers the two in their escape.

However, because of the inability to perceive and understand the 'darkness', Koyomi finds it hard to run away from the unknown entity and Mayoi loses one of her hair ties and part of her left sleeve in the process. Koyomi picks up Mayoi on a frantic escape by bike to elude the invisible threat. The two are about to engage in their usual advance, but Mayoi (and eventually Koyomi) is taken aback by something that can be perceived, but cannot be seen, something that he describes as 'darkness' ( kurayami). Worse, Koyomi is late for the start-of-term ceremony and he has yet to return Mayoi's backpack.ДЄfter having a short conversation about Mayoi having the impression of a slug (a snail without it's shell, that is her backpack), she and Koyomi head to the Araragi Residence, where Koyomi had to dash to pick up Mayoi's backpack. Unfortunately, as he retells the experience with Mayoi on the way back, he discovers that Mayoi had no interest of being revived whatsoever. On August 21, before Nadeko's outrage in early November, Koyomi joined Shinobu in a short experience of time travel together.

One piece season 17 episode 17