Jay, the protagonist, is influenced by the donor's memories and habits after a heart transplant. He coincidentally meets Arthur, the donor's ex-lover and a member of a criminal organization, and gets involved in the underworld. He can only return home if he remembers where the items stolen by Owen, the heart donor, are located... A rival organization constantly engages in sabotage and a series of incidents and accidents ensue. Jay and Arthur gradually become closer as they overcome crises together. Will the two be able to return to their daily lives safely?<br><br>(Source: Ridibooks, translated)

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