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Yun-lee is a girl who is carrying a huge emotional scar in her heart. Due to an accident, she lost 2 precious years of her life, the time period between 19 and 21 years old. Her life is empty. She is miserable, but still attending a preparatory school in an attempt to catch up with all the time she has lost. Suddenly, one day on her way to feed some stray cats, she comes across a young man who seems to have what she has lost… the period between 19 and 21 years old.
Fifteen-year-old country girl Suzume Yosano has to move to Tokyo to live with her uncle due to her father’s transfer. She bumps into a mysterious man who ends up taking her to her uncle’s place after she gets lost. Turns out, Suzume will be seeing him a lot more often once she starts school because… he’s her homeroom teacher?!
It starts with poisonous herbs under the cradle. Then under the sheets. And inside the clothes. Even mixed in the milk that they feed the newborn. This way the child gradually gets used to poisons and becomes the perfect assassination tool—the “Poison Princess” whose every kiss, tear, and even touch bring death. Her only chance of survival is to fulfill her duty as an assassin and find a way to live on in the enemy land she is sent to…if her heart is strong enough.