In 2013, Funaki participated in Morning Musume's first 12th generation audition and made it to the final round, but was not chosen to join the group.
On December 7, Funaki was officially introduced as a Hello Pro Kenshuusei at the Hello Pro Kenshuusei Happyoukai 2013 ~12gatsu no Nama Tamago Show!~ alongside Risa Yamaki, Yumei Yokogawa, Kisora Niinuma, Hirona Oura, Ruru Danbara and Akane Haga.
On November 5, it was announced at Country Girls' first anniversary event that she would be joining the group alongside Nanami Yanagawa.
On June 9, 2017, it was announced that Country Girls would be ceasing regular activities and that three of the members, including Musubu, would be transferring to other Hello!
Project Station, it was revealed that Musubu would be joining Angerme as a new 6th generation member alongside Ayano Kawamura.