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This book is a long suspense novel by an imported Japanese author, telling the following story: I must have been killed. But where is this place? When I noticed, I saw a resort beach and bungalows in front of me. According to the mysterious newspaper received every morning from the invisible deliveryman, it is learned that six people who have died tragically in this world have returned to this paradise mansion with no memory. Who I am? Why was he killed by someone? ? We want to know the truth... This book is a "everyone is dead" mystery novel with a novel setting and novel style. The "Heaven" in the title of the book refers to the "Heaven Mansion" where the events in the book take place, and is also a combination of the names of two key characters.