Sarutobi Mirai has a lot to live up to as the granddaughter of Konoha's Third Hokage and the daughter of Sarutobi Asuma, the hero who gave up his life during the Great Ninja War. But as everyone continues to expect great things from her, she struggles to separate herself from her family's legacy and find her own way.

When Mirai is assigned a supersecret mission to protect Kakashi and Guy on their journey to the Land of Steam, she expects to fend off assassins around every corner. Instead, she finds herself babysitting two grown shinobi who are acting like an old married couple on a hot springs vacation! What's a girl trying to prove herself to do?