Dan Lei, who traveled through the Type-Moon Universe, fought hard to win the Holy Grail War, and wished to go home in order to leave the terrifying timeline with Chaldeas.

As a result, the Holy Grail can only send people out of the root of this world.

Moreover, this is the Type-Moon world connected to the Tree of Imaginary Numbers.

Dan Lei: I wished to go home, why did you throw me into the Star Iron Universe? And I became a dragon clan!

It’s okay, the Holy Grail is still there, and I am also an immortal. At worst, I can travel again after I have charged my energy!

No, the balance and memory are targeting me. Why do I always travel to a world with my memory as the coordinates?

The two star gods joined forces to "serve" him, and Dan Lei said that he was blessed in this life.

So, Dan Lei began to "travel" to various worlds with the heroic spirit.

In the Demon Slayer world, he called himself a patrol ranger, and in...

Chu Ge, who traveled through the fantasy world, finally awakened the system eighteen years later.

It was just the name of the system that made him a little unable to hold back.

The villain writes a diary and checks in the check-in system?

What stitching monster?

On the first day of the system, reward the spirit.

On the seventh day of the system, reward the king body.

Receive the system for thirty days and reward the holy body.

As Chu Ge kept writing his diary, changes began to occur around him.

Many years later, facing many lucky sons and the beautiful female fairies beside her.

Chu Ge: "The system misled me! I am really not a thief Cao!"

"Dumbledore, hasn’t he already graduated? Why is he back at school?"

"Oh, Severus, don’t be so nervous. He’s the new Defense Against the Dark Arts professor!"

"Damn it! If I catch him using a cauldron to cook hot pot at school again, I swear I’ll duel him!"

...

"You are the worst class I have ever taught!"

"But, Professor… isn’t this your first class?"

...

"Miss Granger, as the study committee leader, you’ll guide everyone to read by the Black Lake every morning."

"Mr. Potter, as the sports committee leader, after reading, take them for a run around the Black Lake!"

...

"The countdown to the O.W.L. exams is 100 days!"

"Break the cauldrons, sink the boats—fight for full marks on the O.W.L.s!"

Douglas Holmes, a Hufflepuff with an Eastern soul, returns to Hogwarts three years after graduation to apply for a teaching position—

and brings a whole new style to the school.