The first film in a duology adaptation of Haikara-san ga Tooru. During the Taisho era of 1918, 17-year-old Benio Hanamura thrives on bucking tradition. As a boisterous and quarrelsome tomboy, Miss Hanamura leads a life of kendo and tree-climbing adventure with her best friends Tamaki and Ranmaru. Benio determines to find love on her own, though her family has other plans. Benio will encounter tests of love, independence, and friendship during wartime.