After meeting a playful yet dangerously skilled Hunter, Illumi Zoldyck slowly becomes obsessively devoted to her in secret. What starts as curiosity turns into a toxic attachment as he quietly inserts himself into every part of her life — eliminating threats before she notices them and worshipping the ground she walks on without ever openly admitting it. Meanwhile, she finds herself just as drawn to him, teasing and provoking his possessive nature while slowly becoming addicted to the dangerous comfort only Illumi can provide.