响（广濑铃 饰）答应帮助好友千草递情书给关矢老师（中村伦也 饰），哪知道在误打误撞之中将情书放在了伊藤老师（生田斗真 饰）的鞋柜里。伊藤老师是学校里出了名的冷面杀手，平日里看起来毫无感情，但响却在偶然之中发现了他热情善良的一面。实际上，伊藤也曾有过一段刻骨铭心的爱恋，但这段恋情结束的过于惨烈，让他对爱情彻底失去了信心。 　　响渐渐喜欢上了伊藤老师，她用自己的温柔和天真融化了伊藤老师内心里的坚冰，两人终于互诉衷肠开始了交往。然而，伊藤老师冷冰冰的态度还是让响常常处于不安之中，不仅如此，伊藤老师曾经的恋人美崎来到了响所在的学校成为了实习老师。Hibiki is an awkward, 17-year-old high school sophomore who hasn't known romance. But she's about to fall in love for the very first time. With whom? A man who isn't great with words, but compassionate about his students. It's her history teacher, Mr. Ito. "Is it okay if I fall for you?" Hibiki asks. "I'm afraid I can't return those feelings," is Ito's reply. Hibiki's first love crashes before takeoff. But it doesn't matter. "Still I want to cherish my crush anyway." A teacher's heart begins to turn by a student's pure love.