Well, without having read 'the last to vanish a novel', it could be about a magical realm where different magical beings are disappearing and there is one who is the last to vanish. It could be full of adventure, as the main character tries to figure out the cause of this vanishing and tries to prevent it, exploring themes of friendship, loyalty, and the power of magic along the way.
Since I don't know the specific 'vanish game story', I can't say for sure. But it could have a brave hero as a main character, someone who is determined to solve the mystery of the vanishing.
I'm not sure which specific 'vanish game story' you are referring to. There could be many games with a story related to vanishing. It could be a game where characters disappear mysteriously in a spooky mansion or a magical realm.
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One reason could be a powerful dark magic spell cast upon him by a new villain in the fanfiction world. This spell might be designed to make him disappear from the wizarding world entirely.