At last, the dream of Katyusha and Nonna is right in front of them!! The national tournament has finally begun. Katyusha and Nonna, though nervous, take on their first match, but unexpectedly, Katyusha collapses during the game! In an effort to fill Katyusha's spot, Nonna bravely infiltrates the enemy school, Bonple High School's territory...!?