The Bansho Association, led by a ninja girl and a bazooka toting cow named Hirosuke, has mistakenly come to Momotsuki Academy searching for the little kid who they believe is a Bansho. In one fell swoop, Ichijou manages to difuse and reignite the group and eventually the students all team up to face their enemies head on.
In hopes of turning him against his teammate, Serizawa dressed up as a pregnant and confesses her love for Hirosuke... who responds by shooting her with a bazooka.
Everyone is seemingly killed around the 16 minute mark and the ending credit roll begins. The song used features Becky singing about the struggles of being a genius.
After the credits we go back to the preceeding scene and we see that the principal of Momotsuki Academy has rescued everyone and given Becky a giant robot to fight against the intruders.