When Koyomi realizes they were sent into the past the day before Mother’s Day eleven years ago, he decides to take the opportunity to save Mayoi’s life. Shinobu is dubious, but goes along with the plan. While they’re there, they also spot a younger Koyomi and a younger Hanekawa. Once they locate her father’s house they stake it out in the morning, but she’d already left earlier. They find her, Koyomi startles her, and while chasing her she is almost hit by a passing truck in the crosswalk, but Koyomi pushes her to safety just in time, and then escorts her to her mother’s. Shinobu opens a portal back to the present, but when they return, they learn that the world has been destroyed.
While discussing their unique temporal situation and their singular opportunity at hand with Shinobu, Koyomi concedes that he may not be able to prevent the oddities of all the girls from coming into being; not even Senjougahara’s weight crab. Those oddities were formed from very specific circumstances and sequences of events involving more than just those girls. But Mayoi, he opines, is different. She simply died in a random accident on the way to seeing her divorced mother. And he feels that their ending up eleven years in the past wasn’t random: even if it’s only a stopgap measure, he’s determined to save her and help her find her way.
So after crossing paths with the tiny, flat-chested, but otherwise identical-to-present Hanekawa Tsubasa and almost letting Mayoi slip through his fingers, Koyomi does indeed save her and deliver her to her mom’s, and all’s well that ends well…until they return. In the end, we don’t see the present; Koyomi only describes it in the bleakest terms before the episode cuts to black. But it’s clear that saving Mayoi meant dooming the present he and Shinobu knew. Even if he thought it was a random accident, the only reason the present he knew existed was because Mayoi died in the past. What he saw as righting a wrong only made an infinitely bigger wrong.
Rating: 8 (Great)