An adapted story from U-Jin's manga, the tale depicts the lives of siblings Anzu and Naruto Nozaki, who are poised to inherit their family's fortune. Despite seemingly controlling Anzu, Naruto is in fact deeply in love with her, and their lack of biological relation only fuels his feelings. This obsession leads Naruto to keep Anzu locked away in the family mansion, devoid of a normal life with friends or companionship. As Anzu approaches the age of sixteen, she begins to rebel against Naruto's confinement, even sneaking in a kitten against his wishes before ultimately fleeing in a delivery truck. Naruto eventually catches up to Anzu and realizes that he can no longer hold her captive, thus agreeing to let her lead a normal life. However, tragedy strikes just as they come to this agreement.