Chisui (チスイ) is the third successor of Hayase's will.
Chisui has long hair styled into two pigtails. Like all of Hayase's descendants, Chisui has eyes that resemble her ancestor's and she wears the standard Defense Corps uniform that all leaders wear. She also carries a long sword on her back.
Fushi described all of Hayase's descendants as being weird and overly friendly towards him, so it can be assumed that Chisui acted the way all of her ancestors before her
It can be assumed, as with all other descendants of Hayase, that she has been taught to love and protect Fushi.
After an unknown period of time, Chisui finds Fushi and introduces herself as the third successor.