Musubi is the main female protagonist of the story and is the first of Minato's Sekirei. She met Minato when she fell out of the sky. She is a power-Strength-type Sekirei. After hearing Tsukiumi say that she is Minato's wife she decides that she is gonna be his wife too. She is very naive and often says things she does not understand. She also eats a lot. At times she has a ferocious bear appear behind her, which didn't actually appear until after she became Miya's disciple.