A powerful stitch witch could come back as a doll. Minako ties the ends into a bow to seal her in. Draws a magic sigil over it in lipstick to make sure she can't hop to Tomosuke.

It was Nui's lipstick, Minako's a chronic borrower like that. She never got around to using it - which makes this an indirect kiss good-bye, she's a romantic like that.