Dan da dan, 4

Momo, Okarun and Aira are locked in a space created by the Serponians who show up at the institute by surprise and whose goal is to get the symbol of Okarun's manhood. In this desperate situation, the power of Acroseda's aura awakens in the lovesick Aira. The three join forces to deal with the enemies, but the Dover Devil and Nessie merge. Will this trio be able to fight back against the Serponians?!