20XX.
The number of days in parentheses is the number of days since he became the Demon King.

July 15 : All of humanity will receive the aptitude survey emails at once (episodes 1 - 2).

July 16 : The mastermind lectures Chaos on the World Salvation Project. (Episode 3)

July 17 : Humanity selected by [Chaos] to become the Demon King. (Episode 4 -)
(Day 1) Dominant territories (inviolable zones) emerge around the world.
　　　　　　　Commonly known as "The Great Transformation".

August 16: The pseudo-peace is lifted in all of the Dominion Territories. (Episode 11)
(Day 30) "Revelation of the Goddess" to humanity selected by [Rowe] (Gaiden, Episode 1 (Rina Sayama))

August 19: University students led by Ando invade Theon's controlled territory. (Episode 12)
(Day 33)

August 23: The Realm of Zion's Dominion, a full house. (Episode 15)
(Day 37)

September 6: Theon's level grows to 2. (Episode 16 - )
(Day 51) Some of the realm evolves.
　　　　　　　A demon appears outside the dominion area.

September 17: Selected members of Kanazawa City released their control area. (Gaiden Episode 5 (Rina Sayama))
(Day 62)

September 18: Theon grows to level 3. (Episode 20)
(Day 63) Evolved into a demon king (bloodsucker). (Episode XXII)
　　　　　　　The birth of Chloe, my household. (Episode 20)

October 3: The canon surrenders to Zion.
(Day 78)

October 25: Beginning of Episode 36
Day 100.

October 30: Selected members of Kanazawa City release the fourth control realm. (Gaiden Episode 5 (Rina Sayama))
Day 105.

October 31: Kanazawa City Selected members invade the territory controlled by Zion.
(Day 106)