Mikoto Urabe is the central female lead of the story, a transfer student who enters Kazemidai High School as a second-year. Her private life, family background, and past are almost entirely unknown, which contributes to the air of mystery that surrounds her. From the moment she arrives, she stands out because of her unusual behavior and emotionless demeanor. She is aloof, unsociable, and frequently falls asleep during class, causing her classmates to view her as strange and keep their distance. Despite this cold exterior, she has a short temper and displays some tsundere traits, but beneath the surface she is compassionate, loyal, and vulnerable. Her primary motivation appears to be forming a genuine, lasting romantic connection, which she finds with Akira Tsubaki. Their relationship begins when Tsubaki accidentally tastes the drool she left on her desk and becomes physically addicted to it. This drool bond allows her to transfer her emotions and bodily fluids to him, and she explains that this addiction is a form of love sickness. As the story progresses, the bond deepens into genuine love, and the narrative strongly suggests that they will remain together for life. Her role in the story is that of the mysterious girlfriend herself, driving the unconventional romance at the heart of the series. Key relationships include Tsubaki, her boyfriend, and Ayuko Oka, who becomes a close friend and confidant. She also has a rival in Aika Hayakawa, who attempts to come between them. Mikoto’s character development moves from distant and enigmatic to openly affectionate and deeply attached to Tsubaki. Her most notable ability is the drool bond, which creates a unique physical and emotional link between her and Tsubaki, allowing them to share sensations and emotions. She also carries a pair of scissors and uses them occasionally. Overall, she remains an enigmatic figure whose true origins and inner world are never fully revealed, but her relationship with Tsubaki defines the tone and direction of the series.