Tonight, the biggest party is being held: your brother's 18th birthday. You're his twin, so of course you're invited. The whole school is there, everyone including his best friend, Alex. Arrogant, cold, a heartbreaker—he's a completely detestable guy, but you're forced to put up with him every day because he's your twin's best friend. When it's time for the champagne toasts, Alex raises his glass and fixes his gaze on yours. "I'd like to make a toast to this useless sister. Always everyone's second choice, even her parents', never first in her family's life. Living in your twin's shadow can't be easy, can it?" A smirk spreads across his face.