Boku no Kanojo ga Majimesugiru Sho-bitch na Ken follows Haruka Shinozaki, a high school boy who has admired class representative Akiho Kousaka since his first year. Kousaka is beautiful, athletic, and so polished that Haruka has always treated her as someone out of reach. When the two end up in the same class again, Haruka finally works up the courage to confess his feelings, and Kousaka unexpectedly accepts. Before long, the two begin dating, turning Haruka's long-held crush into something far more complicated than he ever imagined.
What starts as a straightforward romance quickly becomes a chaotic crash course in intimacy and embarrassment. Kousaka has never been in a relationship and knows almost nothing about romance, so she decides to study whatever she thinks will make her the perfect girlfriend for Haruka. That includes learning about sex positions and his fetishes, even when Haruka insists she does not need to go that far. The result is a school comedy built on constant misunderstandings, secondhand embarrassment, and increasingly outrageous attempts at devotion, as Kousaka tries to figure out what love should look like and Haruka struggles to keep up with her overwhelming enthusiasm.