Hmm! Is Nanafuse a ghost?
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Indeed, he is a ghost. His full name is Hiroyuki Nanafuse. Let me tell you fun fact about him! Hiroyuki Nanafuse (七伏 博行 Nanafuse Hiroyuki) or simply Nanafuse (七伏 Nanafuse), is a ghost that is known as the Seventh Wonder, someone that no one knows and no one has seen. However, this may be due to the fact that after those who see him recognize he is a ghost, he starts to vanish and the user slowly begins to forget about Nanafuse's existence.