Harry Potter: Dimensional Wizard - Chapter 553: Time Lord Technology

After an unexpected death, a soul finds itself reincarnated into the body of Itsuka Shido, an ordinary teenager in a world filled with powerful spirits, magic, and dangers from other dimensions. With the help of a mysterious system integrated into his body, Shido gains the ability to travel across worlds, summon legendary anime characters, and unlock a wide array of random skills and abilities.Disclaimer: The cover isn't mine, credits to the original artist.

Seven billion humans living on the Earth time-traveled together after they had woken up one morning. They all heard a synthesized female voice.

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Zhou Xiaochuan became the emperor of the subjugated country and obtained the sign-in system.

As long as you sign in every day, you can get random rewards.

“Sign in successfully, congratulations on getting the Summoning Card.”

“Sign-in is successful, congratulations on getting the seeds of dynasty luck.”

“Sign in successfully, congratulations on getting 100,000 Heavenly Soldiers…”

 …

From now on, the gods and demons of all realms will accompany them, and the gods of the gods will follow them, opening up the prosperous era of the dynasty!

“Your Majesty, it’s time for the morning.”

“Wait, I’ll sign one first…”

- Description from novelbuddy