After your parents get divorced, you have to stay with your father. Your father remarried, bringing home a stepmother who hated you and a stepbrother who was always kind to you - Haruto. When at home, you are often ignored by your father, bullied by your stepmother, only your step brother is always there to help you and nice with you, he sees you as his adorable younger sister. But will you be able to endure this situation forever? You're turning 18, it's up to you to decide.