Honkai Impact: Dreams and the Holy Grail, but the Servant is Rei.

Meng Weiyu, who traveled through the Collapsed Iron Pass, made a bet with the Lord of Pleasure—if he could enter "Dreams and the Holy Grail" and complete this brand-new "Holy Grail War Mini-Game," he could embark on a journey home.
With Aha's "help," he stepped alone into the center of the summoning circle, using flesh and blood and memories as relics, attempting to summon a character from the Honkai Impact 3rd arc as a Servant for the "Holy Grail War."
"In response to the call of the Holy Grail—if you wish to follow this will and this truth, then answer me!"
A girl with pink hair and a purple dress is about to appear.
But at the last moment, he became confused.
The scarlet spearhead pointed at the young man's brow.
This time, no one stood before him with a sword.
[Ding! Master detected that you accidentally pulled from the wrong gacha pool and obtained Archer through the guaranteed summon. You have obtained the gold stat [Projection Magic - Level 1 (0/100)]]
"How can a time traveler not have a cheat code?"
"【The Performer's Encyclopedia】, activate!"
This is the story of a time traveler who longs to return home. Together with Caster [Xi Lian], they rebel against their predetermined fate on a stage that has been set up for them, and eventually grow into the Envoy of Joy.
[This is a fanfiction about Honkai Impact 3rd's Starry Sky Railway, without a harem element. It focuses on battle revelations and exploration, with minimal romantic pairings. Only the main characters and a few villains are original, the main storyline remains unchanged, and it has a happy ending. Characters from Pinoconni's past, such as Kafka, Yun Li, and Mikhail, will appear in turn, and other characters will also have roles.]