Under Night In-Birth takes place in a fictional modern-day setting some time in the 21st century. A phenomenon called the Hollow Night (虚ろの夜 utsuro no yoru) has been enveloping particular regions of Japan once a month for several centuries. Each area engulfed in the Hollow Night is beset by shadow-like creatures called Voids (虚無 kyomu) that utilize and feed upon a power known as "Existence", or EXS (イグジス igujisu). Normal humans cannot see or come into contact with Voids, but certain people have the potential to perceive them. Those who acquire this perception are targeted by Voids and risk either being consumed by them or losing their sanity. Under special circumstances, a person who maintains their sanity after being attacked by a Void can become a being known as an In-Birth (インヴァース invāsu). While this status places a person into a sort of limbo where they are neither living nor dead, they also gain the ability to control Existence. The protagonist, Hyde, is one character who survived a Void attack and became an In-Birth.
Many characters are involved with the Hollow Night phenomenon, and several of them are affiliated with particular organizations. Two rival groups, the Yatō (夜刀) and Licht Kreis, both serve to maintain order in areas affected by the Hollow Night but differ in their methods. The now disbanded Yatō primarily hunted Voids, while Licht Kreis uses its lawful order and hierarchy to protect civilians. A third organization, Amnesia, is more chaotically structured and seeks to stop the influence of both the Yatō and Licht Kreis.
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