This is the timeline for all the events during the course of the story of UNDER NIGHT IN-BIRTH.
The dates for various events vague because the official material only rarely refers to actual dates.
|Year / Month||Event|
|Unknown Date||■ The Hollow Night phenomena begins.|
|Unknown Date||■ A nameless scientist creates the Autonomic Nerves to oversee the Hollow Night.|
|Unknown Date|| ■ Adelheid turns into a Re-Birth for an unknown reason|
■ Licht Kreis is formed.
|15th Century|| Hollow Night Story (Nighttime Void)|
■ The Hollow God visits a nameless village during his travels.
■ Rumors about this mysterious visitor reach the neighboring villages and they attempt to scout out the so-called Witchcraft Village.
■ The Night Blade is created to protect the secrets of the village from outsiders.
■ Rumors about the mysterious magic users of the village reach Licht Kreis.
■ Waldstein is sent to Japan with an army to investigate these rumors.
| ■ The Licht Kreis War begins and the Night Blade emerge victorious.|
■ Waldstein turns into a Human-Void hybrid and chooses to join the Night Blade after having his life saved by Kuon.
■ Adelheid is angered by Waldstein's betrayal. She changes the entire organization structure to accept only female members. Ritter Schild is formed in response to this.
|Unknown Date|| ■ The village elders decide to hide most of their knowledge of EXS into two seals. These seals become what are now known to some as the Secret Arts of Reincarnation and Eternity.|
■ The Sougetsu clan part ways with the Night Blade, taking only their heirloom Iris Blade with them.
■ The internal power struggle within Night Blade is triggered by Seth's ancestors.
|Unknown Date||■ Enkidu's master dies.|
|12 Years Before|| ■ Orie's parents are murdered by a Void that speaks human language.|
■ Orie is taken in by a Licht Kreis orphanage. Some time later, she meets and becomes friends with Lex, Mika and Kaguya.
|10 Years Before|| ■ A young Seth meets with a girl named Chitose and tells her of his desire to protect the Princess of Night Blade.|
■ During the same night, Chitose is killed by unknown causes and the Princess of Night Blade transfers into her next body.
|9 Years Before||■ Nanase and Phonon become friends at grade school.|
|Year 20XX -1||Autumn|
■ Wagner arrives in Japan as punishment for her previous actions.
Orie's Story (A Just Messenger)
|December|| Yuzuriha's Story (Ancient Guardian and The Devil's King)|
■ The Demon Society, Bankikai is created by Ogre.
|Year 20XX||January|| Chaos' Story (The Sage Cometh In the Night)|
■ Chaos turns into an In-Birth and steals a forbidden tome from Licht Kreis. Gordeau scouts him out to become Amnesia's strategist.
|February|| Carmine's Story ("You're really pissing me off!")|
■ Carmine becomes an In-Birth. He meets with Gordeau and a strange boy called Azel.
|March|| Byakuya's Story (I Love My Sister)|
■ Byakuya's sister, Tsukuyomi dies in a car accident. In his despair, Byakuya wanders into the Hollow Night and becomes possessed by Void-like powers.
|April|| Wagner's Story (A Saint Appears)|
■ Wagner deals with regular school life while also investigating the recent increase of In-Birth activity within Kanzakai.
Gordeau's Story (Amnesia Vs. Bankikai)
|May|| Waldstein's Story (Power Beat)|
■ Waldstein and Linne arrive in Kanzakai. They sneak into Amnesia's party while trying to gather info on their leader, Paradox.
|June|| Seth's Story (Chained Soul)|
■ Chaos acquires The Eliminator from Kuon. He uses it as a bargaining chip to make a deal with Seth. Seth starts to accept orders from Chaos.
|July|| Strix's Story (A Girl Serene)|
■ Strix meets with a strange boy called Byakuya and they decide to work together. Strix starts to act like Byakuya's sister.
|August|| Phonon's Story (A False Identity, A True Self)|
■ Phonon turns into an In-Birth and is scouted out to join the EFG.
|September|| Merkava's Story (The Beast and The Hunter)|
Londrekia comes to Kanzakai to investigate rumours of a large Void. He hears from Lex that Wagner is not present in the city at the moment.
|October|| Nanase's Story (Dreams of The Night)|
■ Nanase wanders into the Hollow Night and turns into an In-Birth.
Hyde's Story (A Reluctant Hero)
|November|| ■ Subjugation of Paradox is over.|
*Hilda's Vessel is damaged and she becomes unable to fight for some time.
*Vatista moves into Hyde's residence
*Mika arrives in Kanzakai and moves into Orie's residence
*Phonon leaves the EFG
*Enkidu leaves Amnesia
|Organizations||Night Blade · Licht Kreis · Amnesia · EFG · Bankikai · Ritter Schild|
|Terminology||Abyss · Autonomic Nerve · Curse Commandment · Dual Moon's One Blade Drawing Style · EXS · FLS · Hollow Night · Immortalize · In-Birth · Indulgence Weapons · Kanzakai · Licht Kreis War · Protector of the Shrine · Re-Birth · Secret Arts · Sistema Celeste · Vessel · Void · Void Red · Witchcraft Village · Zero Vessel|