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Kai has just transferred to SMA Bina Indonesia. She meets Kenan, Ale, Aurora, and Re: four geniuses Kai soon ranks higher than in the school’s ranking system. Kai seems to make herself Enemy Number One to the four of them, until an incident breaks Kai's heart... and the hearts of the entire school.

Kai begins to get to know Aurora and despite her reputation as a bad girl, she seems to suffer from the same obsession as her father. Aurora runs into Tyo and begins to realise that something is not right with her father.

Re loves Kai's sister, Jo, who suffers from a serious illness. Kai then quickly becomes Jo's friend. Together, they sense there is something fishy about the school's grading system.

Kai, with the help of Re, Aurora, Kenan and Ale, decides to take action to disrupt mock exams and bring the school's grading system to its knees. Kenan discovers that a key person close to Re plays a major role in this ranking..

While the gang's friendship is threatened, Ale still believes in the strength of their bond. Kai finds faith in Ale while learning to open his heart to Re. Ale discovers that she and Aurora are united by a secret from the past.

Kai, Re, Aurora, Kenan and Ale put their latest mission to the test to unmask the mastermind behind Bina Indonesia's school ranking system. The truth is finally revealed, putting their lives in danger.