Chloe O'Bell was summoned by Yuuki from her first summoning to this world.Leon got in contact with Yuuki and employed him for summoning Otherworlders in order to look for Chloe.The Cerberus underground organization was formed with the collaboration between Yuuki and Damrada.Yuuki formed the Freedom Association and became its Guild Master.Hinata joined the Western Saints Church and soon got promoted to Captain of the Holy Knights/Knights Templars.Hinata later left Shizue after learning everything from her. Yuuki and Hinata came under the guidance of Shizue.

Hinata Sakaguchi was summoned into this world.Yuuki enslaved Kazaream using his Unique Skill. Kazaream summoned Yuuki Kagurazaka into this world.The Hero went into slumber underground beneath the Holy Kingdom Ruberion, watched over by Ruminas.The Hero launched an attack on Leon, freeing Shizue in the process.Leon summoned Shizue Izawa to this world and implanted the fire spirit Ifrit inside her to save her life and control her.Clayman, the Marionette Master, became a Demon Lord to replace Kazaream.Leon Cromwell awoke as a Demon Lord as well as a True Hero.The Magic King (Curse Lord) Kazaream was defeated by Leon.Leon Cromwell and Chloe O'Bell were summoned to this world, Chloe was then summoned elsewhere soon after.The Hero defeated Veldora 300 years ago and used Endless Prison to seal him inside the cave.A Pope, who was a vampire subordinate of Ruminas, was installed. The Western Saints Church was established in the worship of Ruminas.She was later worshipped as the 'God' Ruminas by the Kingdom.

Ruminas moved her vampire kingdom underground while establishing Holy Kingdom Ruberion on the surface for the refugees and people escaping from war.

A Hero appeared in the midst of it and repelled Veldora.

The Storm Dragon Veldora rampaged and destroyed Ruminas's vampire kingdom.

Third generation Demon Lords were born, including Kazaream the Curse Lord (Magic King), Karion the Beast King, and Frey the Harpy Queen.

Birth of Dagrule as a True Demon Lord after his rampage in the war.

Event that occurred once every 500 years - The war with the Angels.

Birth of the second generation Demon Lords, including Ruminas Valentine the Vampire Queen, Dino the Fallen Angel, and Dagrule the Giant, though none of them became True Demon Lords.

Rudra Nam Ul Nasca making those closest to him promise to kill him or find someone that could if he ever lost control of Justice King Michael, mainly because it sees everyone as evil.

Rudra Nam Ul Nasca became Emperor of the Eastern Empire.

Guy Crimson and Rudra started their game of forever war between demons and humans.

Guy, Milim, and Ramiris got acquainted with each other and became the first generation Demon Lords.

The fight between Guy and Milim resulted in a wasteland to the south-west of the continent.

In doing so she absorbed the magic of demons and the powerful aura of dragons and awakened as a Demon Lord.

Ramiris was able to stop Milim's rampage.

In anger, she destroyed that country and awakened as a True Demon Lord at the same time as Guy. Around that time, her pet dragon was killed by some country.

Birth of the True Demon Lord Milim Nava.

Birth of the True Demon Lord, Guy Crimson who granted the wish of his powerless summoner and destroyed both the summoners' enemy nation and his summoners' country as payment.

Formation of the Dwarves' country - The Armanent Nation Dwargon - by its first king, Guran Dwargo (grandfather of Gazelle Dwargo).

Veldanava passed away and reincarnated as his daughter's pet dragon.

Veldanava started the Dragon family first by creating the dragons and then making a rule for True Dragons that they cannot have children with humans because the child will take a large portion of the parent's power.

Star King Dragon Veldanava married a human woman (Lucia) and had a child together.

Rudra Nam Ul Nasca's promise with Star King Dragon Veldanava.

Formation of the Sovereign Alliance of Nasca Namrium Ulmeria Empire, a.k.a the Eastern Empire.

Veldanava was the firstborn True Dragon, the second one was Ice Dragon Velzado, the third one was Scorch Dragon Velgrynd, and the last one was Storm Dragon Veldora. Past to Present History Events and Incidents

11 Tenma Great War Arc/Heaven and Demons Great War Arc.

10 Ryuma Clash Arc/Clash of Dragons and Demons Arc.

Great demon lord rimuru tempest