故事发生在北宇治高中，黄千久美子（黑泽智也配音）刚刚进入校园，对未知的高中生活充满向往。加藤业月（浅井彩配音）是久美子的同学。在野月的极力劝说下，耳朵柔软的久美子半信半疑地加入了学校的打击乐系。从前，器乐系有着非常辉煌的历史。
Elya, 20, is a student and a future ecologist. One day, Matvey, the head of a construction company, came to her university to discuss the development plan for an old forest park. Elya did not hesitate to crush his project. Matvey is very interested in girls' confidence, And used his usual influence method - he just tried to ; purchase She, but Elya doesn't need a sponsor. Then, Matvey was surprised by her indestructibility and placed a bet on Elya: romantic seven days according to his rules. If the girl still decides to leave after that, he will refuse to build a skyscraper in the forest park. When Matvey really paused design work, she agreed. Elya thinks she's a bit like the movie 'Beautiful Woman' The female protagonist in, but it turns out that Matvey is not the person she imagined.
