OVA bundled with the ninth volume of the manga.

Having a friend that knows you inside out should be a good thing, but in Nishikata's case, the opposite is true. 
 
His classmate Takagi loves to tease him on a daily basis, and she uses her extensive knowledge of his behavior to predict exactly how he will react to her teasing, making it nearly impossible for Nishikata to ever make a successful comeback. Despite this, Nishikata vows to someday give Takagi a taste of her own medicine by making her blush out of embarrassment from his teasing.

Middle schooler Nishikata has had it with his classmate Takagi--the chronic teaser who sits nearby. Day in and day out, she comes after him with every sort of trick or prank. Even when he tries to get her back, she's always one step ahead. But rest assured, it's only the beginning. He's not about to give up that easily in this battle of cunning and youth!
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(Source: Yen Press)
 
Note: Includes 13 extra chapters.

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