Magic boob grab restores memories! Ehh….what? Sure, let’s go with that. Let me try to make sense of what happened. The memory loss and regain of Yuuko is pretty obvious, as well as the defeatism of Teiichi after being rejected by Yuuko that is later reversed when he realizes his feelings for her. What I’m more interested in is Shadow Yuuko, who seemed to be trying to keep Teiichi away from other girls due to inheriting Yuuko’s feelings for him.
All of that seems pretty plausible, but I wonder what happened to her in the final scene, where she approaches Kirie with the “who are you” line. Is this because Yuuko regaining her memories has made Shadow Yuuko lose her own? Doesn’t seem so likely. What if they both have the memories now and there’s a rivalry for Teiichi? But that last line still doesn’t make sense because Shadow Yuuko met Kirie before Yuuko’s memories were wiped.
Final theory: there’s a second Shadow Yuuko, who only has Yuuko’s feelings for Teiichi, meaning she wouldn’t know Kirie. Makes sense because Teiichi and Kirie couldn’t see this Shadow Yuuko until the very end, but that’s gonna be annoying to keep track. And what does that mean for the rest of the series? First Shadow Yuuko and Yuuko team up to re-assimilate New Shadow Yuuko into Yuuko? We’ll see, I guess.