Despite it having been a decade since their split, Momo "Maki" Makimura still carries a torch for her former flame, Midori Oonishi. Midori had ended their relationship, citing their age as the primary factor. When the two unexpectedly run into each other, Midori invites Maki to her home, revealing her plans to marry and start a family. While Maki wants to extend her congratulations, something feels amiss after hearing about Midori's fiancé. As they continue to talk, Maki can't help but point out red flags. Eventually, Maki urges Midori to run away with her. In Kakeochi Girl, Maki embarks on a journey to explore the unbreakable bond between her and Midori as she aids her former partner.