The final episode of Aho Girl falls on the tenth anniversary of A-kun and Yoshiko meeting when she and her mom moved in next door. Yoshiko sought a playmate, and it was derision at first sight for A-kun, a stoic, studious five-year-old. She treats every attempt to avoid or get away from her as a game, and never wants to stop playing. When she gives him a big long kiss, he uppercuts her into the sky for the first time.
Realizing the key to keeping Yoshiko away is physical superiority, A-kun begins rigorous training, Rocky-style. Alas, he ends up training too hard and passes out. He wakes up with Yoshiko on top of him, she stayed by his side for an entire day while he was out with a cold. He almost allows that she’s “not that bad” until his mom tells him she was kissing him the whole time. To add insult to injury, his punches can’t even faze her!
If fighting her doesn’t work, A-kun considers other options; after all, he can’t let this go on, lest he end up marrying Yoshiko and having idiot kids with her. So he turns into a demented pervert and chases her around, flipping her skirt, until she cries and he feels guilty for going to far. But even here Yoshiko manages to get the wrong idea, and apologizes for making A-kun “hold back”, removing her panties and putting them on his face.
Ten years later, she’s wearing those same panties (which don’t fit her anymore at all), still trying to play with A-kun when all he wasnts is peace and quiet; and after all these years he still wants to kill her. But if he’s honest, isn’t he glad there’s someone in his life to make things interesting? No. He hates her guts. But does he? Yes.