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Two years into living together, Akihiro Miyata and Takashi Iwanaga are more in love than ever. One day, Miyata unexpectedly discovers a luxury watch that Iwanaga has treasured, only to learn that it was a gift from someone important to him during his student days.

At Iwanaga’s research lab, Miyata meets Hibino, an economist he has long admired, only to discover that Hibino is actually Iwanaga’s ex-boyfriend!

Miyata and Iwanaga enjoy a sweet kimono-shopping date when they run into the young Rui Taniguchi—only to discover that he is another one of Iwanaga’s ex-boyfriends!

Miyata learns that Taniguchi is a well-known rising designer. Faced with yet another of Iwanaga’s remarkably accomplished ex-boyfriends, he begins to lose confidence in himself.

Miyata learns that Iwanaga has bought a luxury apartment for their future together, but he is unsure how to accept such a major decision.

Faced with Iwanaga’s proposal to become lifelong partners, Miyata is unable to give him an answer, and their book project also takes an unexpected turn.