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Maybe Winter Diary and Summer Diary are part of the same timeline ?
I imagined that the beginning of the whole story would have been the Summer Diary PV, when she meets SHU-YA for the first time. Then, next year or several years later, after they break up, she contacted him and reconciliated with him (-> that would be the theme of Spring Diary). Later, she goes see him (-> the last scene of Summer Diary).
Then, she has a plan to make money, so they elaborate together the perfect robbery (-> that would be Autumn Diary/Fall Diary).
And finally, they go to China and put their plan to execution, but SHU-YA dies in Winter Diary.
And... Ayu widowed SHU-YA in.... SEASONS (black dress, black veil).
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