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Originally used by Nana Komatsu, this is a name she made up when she kept imagining that her boyfriend Shouji was having a secret relationship in the anime/manga "Nana". Eventually, he did cheat on her, with a girl named Sachiko Kawamura. A Sachiko is often described as a "man stealer". A Sachiko is actually really sweet and is unaware of the man she's dating's other girlfriend/wife
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