Monster Strike: Zoku Saishuu-wa Pandora no Hako

Following the defeat of the War Gods, Ren and his companions settle into a routine, believing they have returned to normalcy. A new development disrupts this peace when a mysterious girl named Pandora arrives with a box that is meant to remain sealed. Despite efforts to keep it closed, the box is accidentally opened, triggering a strange phenomenon that begins to affect the world. This episode serves as a transition between the first and second seasons of the series.