Arisa Kuhouin is a supporting character from the series, initially introduced as the student council president of Tennouzu First High School. She is seventeen years old and the designated heir to the powerful Kuhouin Group, a fact that places her under significant social and familial pressure.

In terms of personality, Arisa presents a public image that is fastidious, virtuous, and dignified. She takes pride in her role as a leader and works to maintain order and assist her fellow students, which makes her a popular and admired figure on campus. However, this composed exterior masks a deeply insecure and weak-willed nature. Arisa lacks genuine self-confidence and harbors a consistent need to rely on and be sheltered by those she perceives as strong. This dependency makes her highly susceptible to manipulation, as she constantly seeks to prove her usefulness to her chosen protectors.

Her primary motivation stems from this psychological need for security and purpose. She is captivated by the charisma and strength displayed by the revolutionary leader Gai Tsutsugami, developing strong feelings for him after he saves her during a missile attack. Her actions throughout the story are largely driven by a desire to be of value to Gai, often leading her to make desperate and morally questionable choices to gain his approval.

Within the story, Arisa begins as a stabilizing authority figure at the school. Following the outbreak of the second Lost Christmas, her passive leadership style, characterized by a promise that her grandfather’s company would eventually rescue everyone, leads to a loss of confidence among the student body. She is subsequently forced to resign, ceding her position to Shu Ouma. Her role shifts dramatically after she discovers a critical secret: if a person’s Void is destroyed, they will die. Her attempt to reveal this truth results in her being attacked and traumatized. Feeling isolated and betrayed, she secretly allies with a resurrected Gai and actively conspires to overthrow Shu’s regime. She ultimately defects to GHQ and becomes a collaborator, a path that leads her to fatally shoot her own grandfather when he attempts to stop her.

Her key relationships define her tragic arc. Her relationship with her grandfather is one of obligation and, eventually, fatal conflict. Her infatuation with Gai Tsutsugami is the primary catalyst for her betrayal, as she latches onto him as her new source of strength. Her dynamic with Shu Ouma evolves from supportive senior to rival and enemy. A particularly dark relationship is formed with a student named Hirohide Nanba, whom she seduces in exchange for information necessary to execute her coup against Shu.

Arisa undergoes a significant negative character development. She transforms from a respected, if somewhat naive, student leader into a traumatized and ruthless collaborator. Her desperation to feel protected and useful completely overrides her former moral code, leading her to sacrifice her integrity, betray her peers, and commit patricide.

Her notable ability is her manifested Void, which is drawn out by the Power of the Kings. Her Void is known as the Coward’s Shield or the Shield of the Coward. It manifests as a small orb that projects a powerful, multifaceted shield capable of expanding in size and dividing into segments. This shield possesses immense defensive strength, having demonstrated the ability to block and destroy a volley of incoming missiles. The name and nature of her Void serve as a direct reflection of her inner self, a defensive tool that armors a fragile and fearful core.