Misora is Kazumi's best friend, and they are shown to be extremely close, despite Kazumi often getting annoyed or frustrated with Misora's overactive behavior. Kazumi has always been determined to protect Misora, being as she describes herself as being more 'level-headed' than the said best friend. She broad ends this promise to protect her when they are faced with the situation they were forced in.
In Chapter 1 when Kazumi finds Misora on the piano, they greet each other with a hug, then continue on their way, looking for their friends and a possible exit from the school. Misora appears to be very clingy to Kazumi in this chapter, as if she knows her fate.