High school sophomore Yūki Hase noticed that Kaori Fujimiya, his classmate, was always alone. He tried to start a conversation with her but was turned down: “My memories of friendship can last only a week,” she said. Despite of knowing this shocking truth, Yūki keeps trying to be Kaori’s “new” friend every week.
故事描述一位高中二年級女主角香織因為不明的原因，讓她對於周遭朋友的記憶「只能維持短短一週」。她為了不讓旁人誤會或是傷心，在班上漸漸地把自己孤立起來……此時，同班同學祐樹雖然在偶然的機會下也得知這個驚人的事實，但是他仍然心甘情願每個禮拜、每個禮拜重來一次和香織交朋友。究竟開朗又誠懇的祐樹能不能帶著香織走出這個輪迴？ 讓香織在過了一週之後可以親口說出「我們是好朋友」這句話呢？這齣時而溫馨、時而揪心的校園青春生活劇，將要帶給大家一份全新的感動。