Different from the previous movies, this film focuses on the relationship between Misu Arata and Shingyouji Kanemitsu. Started from their 1st meeting when Shingyouji was taken the test to enter in Shidou Gakuen as a junior high student and felt in love with Misu at the first sight, and two years later in the present time. The appearance of the legendary senpai Sagara Takahiro became a problem between them since Misu has always admired Sagara. Takumi, Gii, and Akaike want to help Misu and Shingyouji in this matter. On the other side, there's also a little side-story of Takabayashi and his boyfriend Yoshizawa.