Senritsu Nanami is the student council president and head disciplinary officer of Namimori High. On the second day of her term, a certain freshman attacked her, in attempt to take hold of her latter position. The students could only watch in terror as the famed Demon of Namimori, Hibari Kyoya, lunged at her with his tonfas. "(Notice me, senpai, or) I'll bite you to death."

After 2 years of having secret admiration to Midorima Shintarou, Chano Shizuka finally confessed on their Graduation day—only to get rejected. Why? The reason is simple. Because their Zodiac signs are incompatible. Having her middle school days end with a notable rejection, she was determined to start anew in Shutoku High. Little did she know that their paths will cross once again.