Dan Da Dan, 4

Momo, Okarun, and Aira are trapped in a space created by the Serponians, who arrive at the school unexpectedly with the goal of seizing Okarun's symbol of virility. In this desperate situation, the power of Acroseda's aura awakens in the lovestruck Aira. The three join forces to confront their enemies, but the demon of Dover and Nessie merge. Will this trio be able to fight back against the Serponians?!