Akashi Fuyuki, formerly Natsume Fuyuki, is an ugly bipolar otaku who was currently living with her step brothers and elder sister, who was older than the three of them by 3 years. Akashi Haruka(Formely known as Natsume Haruka) is her biological elder sister while Akashi Seijuurou and Akashi Tetsuya are her step brothers who has the same age as her.

Haruka and the twins are not your typical bishojo and bishonen. They are the geniuses in the house. But Fuyuki was the exact opposite of them. She is your typical supporting character and an ugly one indeed. Her IQ wasn't exactly the highest but it isn't exactly lowest so she is considered as the average one. 

The fact that both her physical looks and average brain, attention rarely was on her. Neither did she yearn for it. She prefer staying in the dark rather than being in the center of attention. Though, she did find it a bit lonely. It has been like this for years but she didn't care.

That is, until her first year of high school.