Based on the manga by U-Jin. This is the story of two siblings, Anzu and Naruto Nozaki, who are heirs to the fabulous Nozaki fortune. Naruto appears to be an overbearing sis-con. In reality, he is madly in love with Anzu, since they are not blood-related. He confines her to the family mansion for "security," depriving her of companionship and a real life. At age 16, she starts to rebel. She smuggles in a kitten as a pet (Naruto hates cats) and then escapes in a delivery truck. Naruto catches up to her and realizes that she can't be confined like a bird in a cage. He agrees to let her have a normal life, but just then, tragedy strikes.