"Arisa" is a psychological mystery manga series written and illustrated by Natsumi Ando. The story centers around Tsubasa Uehara, a high school student who transfers to her twin sister Arisa Sonoda's school after Arisa attempts suicide. Tsubasa is determined to uncover the truth behind her sister's actions, as Arisa had previously appeared happy and well-adjusted. Upon arriving at the school, Tsubasa discovers that Arisa was known as the "princess" of her class, beloved by her peers. However, Tsubasa soon learns that the class is hiding dark secrets.

The narrative delves into the existence of a mysterious entity known as the "King," who orchestrates a dangerous game among the students. The King grants wishes to the class members in exchange for completing tasks, often involving manipulation, betrayal, or harm to others. The game creates an atmosphere of fear and mistrust, as students are pitted against one another to achieve their desires. Tsubasa infiltrates the class and assumes Arisa's identity to investigate the King's identity and the role the game played in her sister's suicide attempt.

As Tsubasa digs deeper, she uncovers the psychological toll the game has taken on the students, many of whom are driven to extreme actions to protect their secrets or fulfill their wishes. The King's influence extends beyond the classroom, with consequences that ripple through the students' lives. Tsubasa's investigation reveals shocking truths about her classmates, her sister, and the origins of the game itself. The story explores themes of trust, manipulation, and the lengths people will go to achieve their desires, as well as the impact of peer pressure and societal expectations on young individuals.

The main characters include Tsubasa, who is determined and resourceful, willing to risk her safety to uncover the truth; Arisa, whose seemingly perfect life hides a web of secrets; and the enigmatic King, whose identity remains a central mystery throughout the series. Other key figures include classmates who are both victims and perpetrators within the game, each with their own motivations and struggles. The narrative builds tension through a series of twists and revelations, keeping readers engaged as Tsubasa navigates the dangerous world of the King's game and confronts the darker aspects of human nature.