A Spider and an Undead, So What?

A Spider and an Undead, So What? (蜘蛛と不死者ですが、なにか？) is a collaboration game event in Mass for the Dead with characters from Overlord and So I'm a Spider, So What?. It was released on January 14, 2022 to February 15, 2022.

Background
Regular summoning experiment in Nazarick. The guests from another world summoned this time are a girl who claims to be the Demon King and a spider. Momonga tries to negotiate a ceasefire while being puzzled by the first case when hostiles are summoned to Nazarick at the same time.

Incident
TBA

Aftermath
TBA