Why did life force people to separate? Was there a deep meaning behind this or was fate just laughing at them, jokingly throwing playing cards? Was their meeting a happy accident, and their farewell a fatal coincidence? If they had met in another reality or at another time, could things have turned out differently? For many years, Akiyama Toru has been tormented by memories of a happy childhood: he hopes to once again see his long-lost friend Yume and find out the reason for his unexpected disappearance. Having entered the university, Toru meets the bright and cheerful Yura Kirsanov, whose “Dream Diary” becomes the key to unraveling the tangled mystery of the past.