The Post-Invasion Arc is the 2nd and final story arc in the Five Worlds War: Prologue and in the 2nd story arc Five Worlds War series. It lasts from Chapters 11-13 and focuses on the aftermath of the Summit Invasion, the news of the Coalition occupations in the other worlds, and the formation of the Alliance.
- In the aftermath of the Summit Invasion, the Alliance is formed.
- The Conquerors Coalition had already mobilized their forces and had occupied several areas in the four worlds.
- In the Soul Reaper World; Huceo Mundo has been occupied.
- In the Pirate World; The Four Blue Seas have been taken over, and the Coalition are begining to move up towards the Grand Line.
- In the Ninja World; Majority of the minor countries have been taken over, and the 5 Great Shinobi Nations countries and the Land of Iron have been surrounded.
- In the Wizard World; Half of Fiore has fallen, including the entire railroad line and the Worth Woodsea forest.
- In the next Summit, the Alliance Leaders select which individuals will be placed as the Commander of each of the Divisions:
- Monkey D. Dragon: Leader of the Revolutionary Army, is chosen to be the Supreme Commander of the Alliance.
- Shunsui Kyoraku: Captain of the 1st Division and Head Captain in the Gotei 13, is chosen to be the Commander of the Alliance's 1st Division and Regimental Commander of the Fighting Divisions.
- Sabo: Chief of Staff, Second in command of the Revolutionary Army, is chosen to be the Commander of the Alliance's 2nd Division.
- Kakashi Hatake: Jonin Of Hidden Leaf Village, is chosen to be the Commander of the Alliance's 3rd Division.
- Byakuya Kuchiki: 28th Head of the Kuchiki Clan, Captain in the 6th Division of Gotei 13, is chosen to be the Commander of the Alliance's 4th Division.
- Jellal Fernades: Guild Master of Crime Sorieice Guild, Former Wizard Saint, and Former Member of the Magic Council, is chosen to be Commander of the Alliance's 5th Division.
- Tsunade: 5th Hokage of the Hidden Leaf Village, is chosen to be Commander of the Medical Division and Regimental Commander of the Support Divisions.
- Yoruichi Shihion: 22nd Head of the Shihion Clan, Former Captain of 2nd Division of the Gotei 13, and former Commander in the Onmitsukido is chosen to be Commander of the Stealth Division.
- Ben Beckman: First Mate of the Red Haired Pirates, is chosen to be the Commander of the Intelligence Division.
- Jura Neekis: Wizard Saint, Former Wizard of the Lamia Scale, and Member of the Magic Council, is chosen to be Commander of the Defense Division.
- The 4 Acts Of Orders, have a spar in Chitsujo palace and experience their skills, and later became friends after ending their spar in a draw.