“I never once thought of Kino as my sister.” Kino, an office worker living a fulfilling life, had been dating her boyfriend for three years when he proposed. One day, she stumbled upon her beloved junior colleague cheating with her boyfriend and was promptly dumped. Then her job was taken away too... At the lowest point in her life, her stepbrother, Koki, appeared. “Kino, will you marry me?” Shocked by the sudden proposal, Kino was pushed into a life as a fake couple by her forceful stepbrother, but—