The protagonist has a weak presence (he disappears later on), and the main and secondary plots are connected to the author's previous book, so it doesn't matter if you haven't read it.

Timeline: Collapse: The time is before the 2.0 main line and after the 1.6 main line

Collapse 3: In the third collapse, the three families were taken to Hyperion and returned to St. Freya Academy

Traveling through the Type-Moon world, Lin Zhen obtains the True and False Dao Fruits. He must gain influence to achieve Dao and become an immortal. Why not just make a game? The Holy Grail War + the modified Delta has launched! [Misaka Mikoto: Is that CS choosing Red A to block the bridge again?] [Red A: ...] [Sato Kazuma: The idiot planner has updated!] [Kiritani Kazuto: The new map is Secret Babylon?] [Oyama Mahiro: Be a planner for a day, and be a filial son.] [Gilgamesh: Bastards, what are you doing?] Years later, as players continue to play, Lin Zhen's power soars, and he achieves Dao, becoming invincible. Suddenly, someone approaches him, saying, "Humanity is about to collapse." Lin Zhen replies, "There's no need to do anything—just talk to my champion players!"

There’s only one rule in this Holy Grail War: out of the 1.5 billion people in this world, the last one standing will win the Grail.

—This is the story of seven kings from different eras descending upon this world, bringing with them their kingdoms, subjects, armies—even their lands. They all converge on Jerusalem to conquer it, fighting for their respective ideals and nations, in a battle to seize the ultimate Holy Grail. In short, it’s the Kings’ Holy Grail War!

The Conquering King, the Heroic King, the Omnipotent King, the Sun King, the Thorn King, Charlemagne, the Holy Roman Emperor, the King of Magic…

Faced with such terrifyingly powerful opponents, Suya—who transmigrated into this world, was forcibly dragged into the war for the survival of Britain, and became the rightful King of the entire land—realizes:

No matter the reason—whether it’s to stay alive, to protect a fake crown, or for the sake of the false Knights of the Round Table who follow him—right now…

“I must draw my sword immediately!”

"Little white mouse, why did you come to my lab?" (Excited) "Because the pay here is low, the workload is heavy, and there have even been scandals involving sudden employee deaths and human experimentation." (Serious) "...Masochism?" — "Infinity" Mobius "Hi, are you the rumored troubled newcomer? I'm Alicia, deputy leader of the Thirteen Heroes. What do you want to talk to me about?" — "True Self" Alicia "Those eyes are long dead. I don't understand why you joined the Fire Moth, but I can't refuse Mei's decision. You... are already trapped." — "Savior" Kevin "Family, love, longing, desire... That guy has none of that. He's like an exquisite puppet, irritating." — "Ao Mie" Qianjie People call hell the human world and greed hope. They always disdain silent anger, but have a special liking for justified cruelty. There is no hope in this world, just like a moth chasing a flame. Only when it is incinerated... do they realize what they have walked into. I am just like a moth chasing the flame. — Meltina "Purgatory"

"My name is Duanmu Huai, also known as Kamen Rider Blade."

For the one I love, I will fight fate to the end and win to show you.

TURN UP

(PS: Honkai Impact 3rd fanfiction, Kamen Rider Sword, no system, multiple female protagonists, slow pace, not a cool story, the main plot is two years before the main line of the game, and enters the main line of the game in the middle and late stages.)

Also known as "Kamen Rider: The Sword Picked Up by Raiden Mei"

Honkai Impact 3rd: The Immortal Emperor Who Cuts Off Fate

Shen Fei arrived on Teyvat and activated the tour guide system. The first guest he bound to was Ying, who was searching for her brother. Aside from Ying, Shen Fei discovered that the only guests he could bind to were demons. So, he used various methods to lure all the gods into his tour group. "Lovely and beautiful Lady Finina, the goddess of water, standing before you is Shen Fei, leader of the Teyvat tour group, and..."

Mu Yang traveled to Teyvat and gained access to the character popularity system. As long as he had enough popularity, his strength would become stronger, and he could also customize his own plot, which would in turn affect Blue Star. So, Mu Yang began his own tricks. At the same time, there were more and more discussions about him in the Parallel Blue Star Forum and the live broadcast room. "The new character is so handsome, my family, it's amazing!" "What did this airborne character say? He wants to kill the Wind Dragon?" "I, True Lord, love to tell the truth, Mu Yang is definitely the murderer who assassinated the God of Rock. I am not the one who made up your constellation!"... Later, the players discovered that every year during the Lantern Festival, the Liyue characters reunited, but Mu Yang never showed up.

Saint Freya. Why does the immortal experience morning sickness? Why did the Queen become a mother? Why hasn't the Dean of Student Aid been paying salaries yet? Why has the Bishop's hats increased? What made Ain Tesla such a star? Welcome to this episode of Approaching Collapse: The Cleaner's Path of No Return.

Traveling through a parallel world, Luo Han became the boss of Mihoyo, a company on the verge of bankruptcy.

At this moment, he accidentally awakened the time-travel system, which allowed him to invite game characters from the original world to visit him.

He first tried to invite Nashida to Blue Star, and from then on he came up with the idea of making "Genshin Impact".

Let Nashida shoot the character PV "Happy Birthday" first, and make all the players on the Internet cry!

"Genshin Impact" has unsurprisingly become a hit on the entire Internet. At the same time, as more and more Genshin Impact characters have traveled through time and space, the company's painting style has gradually become strange.

"Lei Dianying: How dare you say I can't cook? Look, I'm going to chop this rice fool into pieces with my Wuxiang knife!"

"Kamisato Ayaka: I want to protest! Why do people laugh at me and call me 'Da Jia Gui Xiu'?"

“Ganyu: Stop talking about my dark history as a child! If you do, I’ll let you guys have a taste of how powerful Teyvat RPG is!”

"Hutao: The Blue Star branch of Wangshengtang officially opens today! Grand opening promotion, buy one get one free!"

"Dolly: Dolly's magical shop has everything. Don't miss it if you pass by!"

"Goodbye! Cage!" On a defecting spaceship, Qingque took one last look at the Luofu Fairy Boat, with a look of pride in her eyes. "Our departure is just like a bird flying into the sky and a fish entering the sea! From now on we will be free from constraints!" But just as she was about to set off, she suddenly received a communication request. As soon as she answered the call, she heard a burst of angry curses from the other side: "Qingque! You bad guy!" "What on earth has Luofu done to you wrongly?" "How could you even do such a heinous thing as defecting?" "Listen carefully! Now! Come back to me and confess your crime!" "In this way, I can still plead for you to Jingyuan and strive for leniency in the future!" "But if you still stubbornly refuse to repent, and I catch you back with my own hands, then you can expect to spend the rest of your life in Youyu Prison!" After hearing these words of persuasion from the other side, Qingque just sneered: "Humph! Fu Xuan! Let me go back?" "Go back and continue to be your foot-washing maid?" "Bah! Daydreaming! There is a saying: "Luofu trampled on the bones of nobles, and burned the immortal boat into brocade ashes!" "If I am the Green Emperor in the future, I will reward you by letting the peach blossoms bloom together!" "Let's see who will be the foot-washing maid then!"