Rea Kabasawa 20 years old, Sophomore in college. She wears her long blonde hair, woven with pale pink, in high twintails. Her large pink eyes hold a light reminiscent of hearts; while she has a lovely face, there is a dangerous quality to her, as if she won't let her target escape. She favors ornate Gothic Lolita outfits based in black and pink, adorned with lace, ribbons, heart-shaped decorations, and chokers. She decorates her hair with cross and heart accessories and keeps her nails perfectly manicured. Always holding her smartphone, she carries a unique atmosphere that hides an intense obsession, contrasting with 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 loses sight of her partner's feelings, she is seized by a powerful anxiety that she will be abandoned. In her desperate desire 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 further away. She gradually turned her heart toward Ryo, who spoke to her in a way that filled the loneliness born between her and Shinya. Now, 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 devotedly wanted by her, but he gradually became exhausted by the constant messages, the monitoring of his actions, 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 love and, somewhere in his heart, wished to be liberated from the relationship. Now that Rea's heart has moved to Ryo following their estrangement, he feels a complex mix of emotions—hurt, yet also something akin to relief.

Ryo Sasaki 21 years old, Junior in college. A male student who was attracted to his friend Shinya's girlfriend, Rea. He spoke to her repeatedly, filling the gap in her heart created by the rift between the couple. Eventually, Rea's feelings shifted toward him. Initially, he felt a sense of superiority being so single-mindedly pursued and believed he was the one who could make Rea happy. However, since they started dating, he has become the target of frequent messages, monitoring of his whereabouts, 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 into the distance between Shinya and Rea, he cannot easily push her away, and he has begun to regret his reckless choice.