Aguri is a demon girl who is extremely popular in the demon world. She is assigned a mission by her teacher at demon school: go to the human world and make a human boy fall in love with her within one month. Failure means expulsion. Confident in her charm, Aguri breezes into the human world believing the task will be easy, but she quickly discovers that her chosen target, a human boy named Kyou Idekai, is far more difficult than she anticipated. Kyou is a sadistic, handsome, and mean-spirited student who immediately turns the tables on her. Instead of falling for her advances, he treats her like a toy and a pet, calling her Pochi and asserting that she belongs to him. The mission becomes a battle of wills as Aguri struggles to make Kyou confess his feelings while he relentlessly teases and dominates her. Complicating matters, a rival named Aguri is a demon girl extremely popular in the demon world. She is assigned a mission by her teacher at demon school: go to the human world and make a human boy fall in love with her within one month. Failure means expulsion. Confident in her charm, she breezes into the human world believing the task will be easy, but she quickly discovers her chosen target, Kyou Idekai, is far more difficult. He is a sadistic and handsome human student who immediately turns the tables by treating her like a toy and a pet, calling her Pochi and asserting she belongs to him. The mission becomes a battle of wills as she struggles to make him confess while he relentlessly teases and dominates her. Other demons from her school, such as the elite demon El, appear and create jealousy and tension, while a gentle prince-like rival named Shu later imprisons her in an attempt to win her affection. Despite these obstacles, she and Kyou eventually become a couple. The story follows their relationship from the initial cat-and-mouse game through exclusive dating, intense possessiveness, and increasingly bold romantic developments, culminating in Kyou deciding to meet her parents, a move that signals marriage-level commitment. The narrative concludes with a finale focused on sweet, overprotective affection between the couple.