Tatoeba Last Dungeon Mae no Mura no Shounen ga Joban no Machi de Kurasu Youna Monogatari EP9 - Suppose you visited an early dungeon but encountered three final bosses?

Witnesses report a huge snake monster in a dungeon near the city. The king sends the cadets to investigate. However, Alka, Micona, and the mysterious man Sou all get involved for their own reasons.