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Minato Sahashi is a rounin, a two-time loser who's failed his college placement exams. Just as he's contemplating giving up and heading home, though, a chance encounter changes his life forever! Enter Musubi, a girl who literally falls into Minato's life! Musubi is a Sekirei, a modified human caught up in a game in which only one of her kind can be left standing. In order to be victorious in this contest, though, she needs to find her Ashikabi (her fated partner)...and guess who fits the bill??