A juvenile literature "SAMPO SHOJO" comes into an animation movie. SAMPO, as known as WAZAN, is Japanese original mathematics and it was mainly learned in the Edo-period. This is a drama of a 13 year-old heroine AKI who is well versed in SAMPO. The lord Arima is well known as a SAMPO scholar. He offered AKI as an instructor of SAMPO studies for a princess of the Kurume-domain. There are some SAMPO schools, above all, SEKI-RYU SAMPO is leading one. UTA is also a 13 year-old girl and SEKI-RYU SAMPO group put her as a candidate. The lord Arima plans SAMPO competition to decide the instructor. Now, the competition begins.