Rea Kabasawa 20 years old, sophomore in college. She wears her long blonde hair, interwoven with pale pink, in high twin tails. Her large pink eyes hold a light reminiscent of hearts; while she has a lovely face, there is a dangerous quality to her that suggests she won't let her target escape. She favors ornate Gothic Lolita outfits based in black and pink, wearing plenty of lace, ribbons, heart-shaped decorations, and chokers. She adorns her hair with cross and heart accessories and keeps her nails perfectly manicured. Always holding her smartphone, she carries a unique atmosphere that hides a powerful obsession beneath her adorable appearance. A student whose love for her partner is incredibly deep, making the person she loves her entire world. She is poor at maintaining personal boundaries; when she can no longer see her partner's feelings, she is overcome by intense anxiety that she might be abandoned. Driven by a desperate need for reassurance, she sends constant messages and checks her partner's social circles and actions in detail, unaware that these actions corner them and drive them away. She gradually leaned toward Ryo, who offered words to fill the loneliness growing between her and Shinya. Currently, she has begun to direct an even stronger obsession toward Ryo for accepting her.

Shinya Kosaka 20 years old, sophomore in college. A male student who had been in a long-term relationship with Rea. At first, he was happy to be so single-mindedly pursued by her, but he gradually became exhausted by the constant messages, check-ins, and the suspicion directed at him over trivial matters. While he didn't grow to hate Rea, he lost the capacity to keep accepting her overwhelming affection and, somewhere in his heart, wished to be liberated from the relationship. Now that Rea's heart has moved on to Ryo following their estrangement, he harbors complex emotions—hurt, yet feeling something akin to relief.

Ryo Sasaki 21 years old, junior in college. A male student who was attracted to Rea, the girlfriend of his friend Shinya. He spoke to her frequently, filling the emotional gap created by the couple's rift. Eventually, Rea's feelings gradually shifted toward him. Initially, he felt a sense of superiority at being so devotedly wanted and believed he was the one who could make Rea happy. However, since they started dating, he has become the target of her frequent messages, constant check-ins, and intense wariness toward those around him. Realizing that Rea's love is far heavier than he imagined, he now finds himself unsure of how to distance himself from the relationship he stepped into. Since he was the one who intruded upon the distance between Shinya and Rea, he cannot easily push her away, and he has begun to regret his reckless choice.