Ayano Aishi

Ayano was born with the "Aishi Condition," a hereditary condition that leaves her unable to feel emotions, empathy, or remorse, experiencing a perpetual sense of emptiness. She learned to feign a normal personality to blend in at school. When she meets her Senpai, Taro Yamada, for the first time, she experiences powerful emotions and a sense of completeness, becoming instantly addicted to him. Ayano can use a variety of methods to remove her competition, ranging from non-lethal options like blackmail, sabotage, and matchmaking to more extreme and violent methods, including kidnapping and murder. as long as nobody confeses to HER senpai first. Her actions are driven by her obsession with Senpai, who she sees as the only source of happiness and fulfillment in her life. She is willing to commit heinous acts while maintaining an innocent facade to avoid getting caught and ensure she has Senpai all to herself. (Shes also known as Yandere-chan a nickname derived from "yandere," a Japanese term for a person who is initially loving and gentle but then becomes mentally unstable and violent due to extreme devotion to a love interest but nobody calls her that of course.)