Thanks to Miyamura’s heretofore unmentioned sister (and scissor enthusiast) Leona, Yamada learns the identity of the seventh witch. Leona tells him because she’s amused he’s doing it for love—specifically to undo the future where Urara is all alone again. But there’s a cost to learning the seventh witch’s identity.
That cost is that Yamada’s memory of the witches—all of them, including Urara—must be wiped, as only President Yamazaki is allowed to know the names of all seven witches. Yamada doesn’t treat it as that big of a deal, especially since his friends and Urara in particular promise to bring him back after his memory wipe. Urara in particular is looking forward to being the first person he kisses, just as she was when they first fell down the steps together.
Yamada takes his leave from Urara, and even though things still don’t seem that serious, there’s an air of wistfulness and even foreboding to their farewell. That’s amplified significantly when the seventh witch, Saionji Rika, appears, boasting about going commando (like Urara made Yamada go when she was in his body) before placing her hands on his face, then walking off, apparently having done the job.
Yamada is confused, then, that even though her instructions indicate it will take 24 hours for his memories to fade…they don’t fade. He enters the supernatural club to announce it didn’t work, but none of them know who he is, or rather, they know he’s Yamada, but have no connection to him.
Turns out Rika couldn’t wipe his memories, due to his immunity to witch powers. Instead, she wiped the memory of all his friends, along with all the witches. In other words, Yamada kept Urara out of that lonely future, only to find himself alone.
Initially, he doesn’t seem all that troubled by this; after all, Yamazaki is honoring his side of the bargain by backing Miyamura, so Urara won’t be alone and sad. But when fellow powers-immune Tamaki keeps asking him to team up with him so they can undo the situation, Yamada kinda snaps and destroys a lectern with his bare hands.
Just as he does so, the person he both saved and exiled himself from, Urara, comes in, wondering if Yamada wanted to join the supernatural club. Yamada refuses, not wanting to cause her trouble, but as she turns away to leave he springs a confession on her, and she rejects him, because she likes someone else.
But even though Yamada gets angry about the prospect of her liking another guy (and the others seem to think she likes Miyamura rather than him), I knew from the get-go that the “other person” she likes is him, but due to Rika’s powers, can’t presently make the connection between the person she likes and Yamada.
It’s a tricky situation to be sure, especially since now that the witches have forgotten Yamada and everything he did to help them, they’re back to stirring up mischief all over school. He agrees with Tamaki that at least playing along Nene’s revitalized plan to gather supporters, her charm power can be put to good use.
The only problem is, Yamada and Nene pick a public place to kiss; a place Urara happens to be walking past and spots them. Now, Urara may not be consciously aware she loves Yamada, and that they both promised she’d be the first one he kissed after Rika did her thing, she’s clearly aware of it on another level, because she gets extremely upset when she sees him kiss Nene.
Yamada is in a deep hole with two episodes remaining. He has a lot of explaining to do, misunderstandings to clear up, relationships to rebuild from scratch, and, if possible, witch powers to somehow undo, and he won’t have the supernatural club or Urara on his side to help him, because she’s/they’re the ones he’s trying to get back.
But he does seem to have the witch killer Tamaki on his side (who doesn’t want to be alone either), and could yet benefit from the powers of Nene and the other witches besides Urara and Rika. He’s down, but he’s not out.