Anime Crossover: I Became a Simulator for Girls

After handling your parents' funeral arrangements, you and your older sister, Kanae, made a pact to slay demons together to protect the happiness of others who haven't yet been destroyed by them.

Half a month later, you and your sister found Himejima Gyomei through 'hidden' means and asked him for advice on how to hunt demons. Himejima Gyomei refused you and advised you to live as ordinary people. You and your sister did not give up. You pleaded with Himejima Gyomei day and night for seven consecutive days and seven nights. Finally, Himejima Gyomei, with huge dark circles under his eyes, agreed to your request.

[The day after you received a promise from Gyomei Himejima, you and your sister set off separately to your respective trainers.]

Your relentless training day and night terrified your trainer. He tried to persuade you to rest, even knocking you unconscious, but you woke up on your own in less than a minute. Under the trainer's guidance, you began to exercise, and your boundless energy kept you passionate at all times.

[You train until your body can't take it anymore every day, then use your rest time to study various poisons. Your trainer sees you as a monster, believing that as long as you don't die, you'll definitely become a Pillar in the future.]

At age 7, you and your sister both passed the "Final Selection" of Mount Fujikasa, and with tears in your eyes, you fulfilled your promise to reunite. You began to fight demons alongside your sister as a member of the Demon Slayer Corps. Even though your strength had surpassed that of your sister, this did not affect the bond between you two sisters in the slightest.

[At age 8, you and your sister slayed demons together. Your strength improved by leaps and bounds. You mastered a branch of Water Breathing, a further derivative of Flower Breathing, Insect Breathing. This breathing technique perfectly suited your body, making full use of your petite stature and high speed, greatly enhancing your strength.]

[At age 9, your older sister became the Flower Pillar of the Demon Slayer Corps, and you also reached the Pillar level in strength, but due to your young age, you did not become a Pillar.]

[One day, while crossing a bridge, you and your older sister, Kanae Kocho, rescued Kanao Tsuyuri from slave traders and took her back to the Butterfly Mansion to raise her. She became your adopted sister.]

[At age 10, you achieved a breakthrough in your breathing technique. Your older sister, Kanae Kocho, the Flower Pillar, encountered Upper Moon Two, Doma, during a demon-hunting mission. Upon receiving the news, you rushed over immediately. Your sister had already been severely injured by Doma, but you couldn't bear it.]

[Through years of relentless training day and night, you've spent three times as much time training as your peers, making you far stronger than your older sister, Kanae. However, your body's potential is limited. Even with your desperate efforts to close the gap, your strength hasn't improved much. Now, facing Doma, you can only rely on your speed and knowledge of poisons.]

Chapter 15 Simulation Ends, Preordained Fate

[You used all your strength and seized the opportunity to inject all the poison you were carrying into Doma's body, but this dose of poison had no effect on Doma. You were severely injured by its Blood Demon Art, and your sister, Kanae Kocho, took the fatal blow for you. You also lost consciousness.]

When you wake up, you've been rescued by members of the Demon Slayer Corps, but your sister is already dead. Your heart is filled with hatred, and your resentment towards demons has reached its peak.

[You began practicing breathing techniques day and night, your daily life consisting of nothing but eating and training. After the battle with Doma, you realized that poison was useless, so you gave all the poisons you had to Kanao Tsuyuri, hoping she would inherit your sister's mantle.]

At age 11, you continue your spiritual practice. Your expression slowly begins to resemble that of your older sister. You miss her and try your best to imitate her mannerisms, afraid that one day you will forget her voice and image.

[At age 12, your breathing technique made significant progress. Abandoning poison, you began to refine Insect Breathing. In the same year, you were designated as the Insect Pillar. The lecherous tailor Maeda Masao made you an open-chested uniform, which you poured lamp oil over and burned in front of him.]

At 13, your tireless training day and night has already set you apart from the other Pillars. Your strength is no longer a weakness; your speed is even more terrifying. Your entire being has become much stronger through intense training, and your robust and powerful physique is proof of your strength.

[At 14, your sister's death spurred you to continue your training. Your training efficiency in a year was three or four times that of others. Your breathing techniques improved rapidly, and you began venturing out to hunt demons. Ordinary demons could be decapitated with a single strike. You easily single-handedly killed a Lower Rank demon wreaking havoc in a village, and your status within the Demon Slayer Corps rose.]

At 15, you traveled far and wide, slaying demons everywhere. The Lower Moon demons were no match for you, and you threw yourself wholeheartedly into battle. Your breathing technique became more powerful, and you grasped the essence of Insect Breathing. But it wasn't enough; you were still not strong enough. Thinking back to the oppressive feeling of Upper Moon Two, Doma, your determination to become stronger became even more urgent.

[At 16, your ranking in the Demon Slayer Corps steadily increased. In the same year, you defeated Upper Moon Five, Gyokko. Your reputation reached its peak, but this angered Muzan Kibutsuji, who killed Gyokko, whom you had injured, and secretly dispatched demons to kill you.]

[At 17, your skills have reached their peak. No matter how much you train, you can't become any stronger. Your breathing techniques have also reached a bottleneck. You've met the strongest opponent of your life: Upper Moon Two, Doma!]

[The instant you clashed, you realized the gap between you two. Humans, even those trained to their limits, cannot defeat demons with their bare hands. You unleashed your modified Insect Breathing, and your speed astonished even Upper Moon Two.]

Even though you had long abandoned your research on poisons, you still carried a full thousand liters of hydrangea vine poison for this battle; you were already prepared to die.

The battle with Doma continued unabated. Your wrists began to tremble. You realized that conventional methods were simply insufficient to defeat Doma before you. You were resigned to death. Having never known sleep, you felt loneliness more easily than most people. Since your sister left, this loneliness had grown infinitely larger.

You injected all one thousand liters of hydrangea vine poison into your body.

[During one of your battles, when you were at a disadvantage, you were swallowed by Douma.]

[You died, but at the same time, Douma also died from the dissolution and decay of his body due to inhaling too much of the hydrangea vine poison.]

You've never slept a single night in your short life. This time, you can finally sleep your fill. Perhaps next time, you'll be able to make better choices.

Shinobu Kocho's life has come to an end.

The morning's classes had just ended.

As the classroom bell rang, the system's settlement screen appeared before Chen Fang's eyes.

In the end, Shinobu's fate didn't change much, except this time she was fighting Doma alone, and her strength was definitely much greater than originally expected.

"But after all, it's only a blue talent, with limited strength. Even if Shinobu uses it to its fullest potential, it will only allow her to train three or four times longer than others. She's still too young. If she were older, in her twenties or thirties, with her body and skills at their peak, she might actually be able to solo Doma without dying."

'But it's only a possibility.'

[Ding! Settlement successful. Your evaluation for this simulation is A. You can choose one of the following rewards.]

[First, solidify the talent. After solidification, the talent will directly affect the host and will not appear in the random talents.]

[Second, Insect Breathing, the final version after Shinobu Kocho's improvements, which marginalizes the effects of poison and maximizes speed and explosiveness in the breathing technique.]

[Thirdly, Shinobu Kocho's knowledge of pharmacology and poisons enabled her to create a poison that could kill even Upper Moon Two.]

Chapter 16 Testing Rin Tohsaka

Option 1 is to directly push.

How could a man like Chen Fang, who makes giving up his career a creed, possibly choose such a boring talent?

If you can't sleep, life loses most of its fun.

Option three is not very useful to Chen Fang. Putting aside whether this world has any special medicinal materials from Demon Slayer, the strength of the herbs alone is not satisfactory to Chen Fang.

"I choose two!"

The next moment, the memory of Insect Breathing entered Chen Fang's mind.

With each slash and thrust, everything Shinobu experienced while practicing Insect Breathing was shared with Chen Fang. Chen Fang's breathing also subconsciously changed, and each Pillar was able to continuously operate and practice the breathing technique 24 hours a day.

Shinobu Kocho could certainly do it, but that was the result of her hard work and training. But now, Chen Fang had directly mastered this technique.

'So powerful! Is this the true power of an extraordinary being?'

If Chen Fang had mastered this power when he encountered the ghoul, he probably could have killed it with a single punch by concentrating the power of his breathing technique into his fist.

Chen Fang stretched, feeling perfectly awake and showing no signs of drowsiness.

Looking at Shinobu Kocho in the simulation panel, her portrait has dimmed like Rin Tohsaka and Utaha Kasumigaoka, indicating that her luck has reached its lowest point.

'System, what's going on? Shinobu Kocho is a superhuman, so why can she only simulate once, just like Kasumigaoka?'

[Please explore on your own, host.]

Alright, Chen Fang didn't say anything more.

The fact that the system can simulate is already excellent; he can't ask for more.

It was lunchtime, and Chen Fang took out a boxed lunch from his bag.

Today I cooked some rice, along with hand-shredded cabbage, stir-fried shrimp, stir-fried green peppers with pork, and a small dish of peanuts. That's Chen Fang's lunch.

The aroma of the food quickly wafted out.

Rin Tohsaka at the next table quietly took out a piece of bread.

Yu Guang glanced at Chen Fang's lunchbox every now and then. This guy, he eats so deliciously every day.

He subconsciously swallowed, and when he looked away, he saw Chen Fang looking at him with a smile.

Rin Tohsaka blushed; she couldn't very well say it was because the smell made her hungry.

Chen Fang said with a grin, "Tohsaka-san, do you want some?"

Rin Tohsaka is Chen Fang's role model, and Chen Fang is still worried about how to enhance Rin Tohsaka's luck, so naturally he has to cultivate a good relationship with her.

"I didn't look over there because I wanted to eat your lunch," Rin Tohsaka said, holding a piece of bread in one hand and crossing her arms. "I just saw a bird flying by, so I looked over there."

Seeing Rin Tohsaka staring intently at Chen Fang's lunchbox, Chen Fang's smile widened: "Really? Did that bird land in my lunchbox?"

As he spoke, Chen took a plate out of the lunchbox and handed it to Rin Tohsaka.

"Please, this is on me."

Looking at the peanuts in front of her, Rin Tohsaka fell silent.

"I don't think the bird flew into the dish."

Despite saying no, Rin Tohsaka still finished the plate of peanuts Chen Fang had fried.

After wiping her mouth clean, Rin Tohsaka glanced at the shrimp shells and the few uneaten green peppers on the table and fell into deep thought. This guy is unwilling to give up even a single piece of meat.

"After you've eaten and drunk your fill, is Chen Fang going to go to sleep again?" The two started chatting after finishing their meal. Since they were sitting at the same table, Rin Tohsaka even ate a plate of peanuts that Chen Fang hadn't intended to eat.

"I had planned to do that, but now I can't seem to sleep," Chen Fang said helplessly.

With the breathing technique rewarded by the system, and the fact that Chen Fang had simulated Kasumigaoka Utaha's life for a whole night in his sleep last night, Chen Fang was full of energy and couldn't fall asleep at all.

"That's it."

The two fell silent. People who had little in common and nothing to talk about ended up like this when they came together.

After a long silence, Chen Fang finally spoke, asking, "Tohsaka-san, do you believe in mysterious forces in this world?"

"Like magicians or the Demon Slayer Corps?"

Chen Fang asked Rin Tohsaka, "There are many ways to improve one's luck, but the simplest way is to improve the other person's strength. If she is not a superhuman, make her a superhuman; if she is a superhuman, make her even stronger."

In this world, even Shinobu Kocho is killing ghouls, so what's impossible?

"Chen Fang, you think magicians' magic tricks are amazing, right? Actually, there are clues behind the scenes."

Chen Fang leaned against the wall by the window, resting his chin on his hand, and said, "Have you ever seen magic tricks made with gemstones? It's about storing all sorts of magical energy in gemstones and then activating them to use them, and things like that."

Chen Fang quietly looked at Rin Tohsaka in front of him.

As expected, after Chen Fang finished speaking, Rin Tohsaka frowned almost imperceptibly, but still calmly said, "What kind of magic is that? I've never seen it before."