Do you like an otaku girlfriend? Obviously the answer is NO, But..... She was come to school only 3 days a week, has sickly body, smart, super popular, and cool beauty "mysterious heroine" Shiraishi Yuki. And an "ordinary protagonist" Sakai Haruhiko who nothing stands out and a harmless guy who does not seems like protagonist at all. The heroine that the protagonist fell in love without knowing anything ... actually a super closet hikkikomori otaku!! Thus, this is my story to understanding her hobbies, walking in thorny otaku path.