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Imouto ga Brocon de Aru koto wo Ani dake wa Shitteiru.

妹がブラコンであることを兄だけは知っている。

Akari Namiki is the perfect little sister: smart, beautiful, and stylish. Her older brother, on the other hand, sees himself as an ordinary mob character. But during his third year of middle school, he discovers the "Onii-chan Notes" in Akari's room—a detailed log of his every behavior. Despite her usual cold demeanor, the notebook reveals her obsessive love for him, along with hidden surveillance cameras and listening devices in his room.

Now in his second year of high school, the brother learns of Akari's plan to "lock up Onii-chan and make it so he can't live without me." Determined to stop her before things go too far, he decides to interact with her strictly as a brother. But with Akari's intense affection and secret schemes, maintaining that boundary proves to be a dangerous and comedic challenge.

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