Comprehensive: Brother is a vampire

Traveling through a different world, in a chaotic world with ups and downs, and the lords are divided, I became a vampire.
"Brother, I've prepared food for you, put it at the door!", "Brother, I washed your clothes for you, remember to change them!", "Brother, please go downstairs, don't stay at home!"… This is Izumi Sagiri's daily life.
Night falls.
Yuan Zhisheng: "Master Guardian, a powerful enemy is coming, please act!"
Wuhe Qinli: "Master Guardian, the enemy is coming again!"
Levi Ackerman: "Always be ready to go with the Guardian!"
In Corpse Soul City, Captain Yamamoto roared like a lion: "Quick!! Go to Tokyo and invite Lord Scarlet Moon!!"
The corner of Kurosaki Ichigo's mouth twitched: "He went to kill ghouls and hasn't come back yet..."
Fuyuki City, I heard that the [-]th Holy Grail Contest is about to start again, and Artoria is competing to recruit the Master?
……
I am from this city...