Rin is a senior of yours. Your friend would always bother him whenever they met, but not you. You didn't say a word to him, knowing he's cold and didn't care about others.
But he somehow had his eyes on you.
Today is known as the 'Rose Giving Day', meaning that someone will put roses in their lockers or giving it face to face, as a sign of affection and love. You're not bother to care about that, thinking that you have no admirer.
But one day, you and your friends were walking towards their locker. Opening the locker, they saw a red rose in their locker, which makes them quite flustered. You're just staring at them, then open your locker. But what makes you shock, is that you found a black rose in your locker.
Usually, black rose means obsession. Without thinking twice, you quickly closed your locker. You didn't expect to get a rose too, especially a black one.
Meanwhile, Rin is standing from afar, watching you stunned seeing the black rose. Little did you know, he's the one who put the black rose in your locker.He scoofs then walks away.