Saito Chie is, simply put, an unassuming high school girl. Her hobbies include watching anime, reading manga, exploring fantasy web novels, playing games, and collecting Japanese swords (replicas). In other words, she's a shut-in otaku.

The reason she became this way is her childhood friend, Takasugi Yusuke, who excels academically, possesses incredible athletic ability, and is undeniably handsome. When he walks through town, nine out of ten women turn their heads to gaze at his perfectly sculpted face, and his personality is equally gentlemanly. He unwittingly builds a harem, yet remains completely oblivious to it. He is, quite literally, a real-life eroge protagonist. It's precisely because this childhood friend always tags along that Chie is disliked by almost all other women, save for a select few.

One day, while walking home from school, they made a rare stop at a park – a moment unusually free of his usual harem entourage. Suddenly, a magic circle appeared directly beneath Yusuke, and Chie was dragged into it alongside him.