Start the time travel simulator from Sky Sister!

Others may not know, but he knows.

These two are half sisters.

But for some special reasons, I don't want others to know the inside story.

"Of course it is like that~"

There is some deep meaning in You's words.

Nagisa Ichiha's face turned even redder, but she didn't know what to say and was stuck for a moment.

……

While we were chatting, it was already twelve o'clock.

【Ding--】

[The number of times you have crossed the simulator has been updated. Do you want to simulate it? 】

"Start simulation."

You responded.

At the same time, the students around him froze in place, as if time had stopped.

After all, this seems to be the case every time the simulation is turned on, and You has gotten used to it.

But looking at Ying beside him, he couldn't help but pinch her soft cheek.

"So cute."

Yuu murmured.

Then he turned his head and continued to look at the simulator.

[The current save file is "No. 003". Do you want to switch the save file? ]

"Create a new save file."

【learn. 】

[The last rating was B, so the host can inherit two talents, and then extract talents. ]

"Inherit the swordsmanship genius and violence!"

You spoke frankly.

After all, they are two purple talents.

Then he continued:

"Turn on the talent extraction."

[Start extracting talents...]

【Ding--】

[Extraction successful! 】

[Available talents: Natural Affection (blue), Swordsmanship Genius (purple), Rage (purple), Medical Saint (orange), Resident Certificate (blue)]

["Medical Saint": You are a natural saint of medicine. You have a very high talent for medicine. It can be called a terrifying talent! ]

[「Resident Certificate」: After traveling through the world, you will obtain the identity of this world, and you will also be a person with an identity. 】

"This Medical Saint is a bit outrageous... He is actually orange..."

"You know, if a swordsmanship genius is only purple, then this medical saint must be so strong?!"

You stroked his chin, sighing uncontrollably, and then looked at the other talent, muttering, "Resident ID card, does that mean I won't travel through time blindly like before?"

"This feels good too, I hope to stay here permanently..."

[Talent extraction completed, do you want to enter the simulation? 】

You took a deep breath and said:

"Let's go! Enter the simulation!"

Chapter 13: Becoming a Ghost Again

[Time travel simulation is starting...]

[On the first day, you became an ordinary ghost, but you were afraid that Muzan would spy on your memory as a time traveler, so you wanted to cut off your connection with Muzan. Moreover, as a ghost, you did not want to eat people, so you went to look for Tamayo according to your memory.]

[Relying on your memory, you found Tamayo in Asakusa and asked her to help you cut off your connection with Muzan. ]

[Tamayo is a very gentle person. Even though taking you in might expose her position, she agreed to it and started making medicine for you.]

[When you saw those medicines, you instantly became interested and began to learn from Tamayo.]

[You have a strong talent. You can memorize all the formulas that Tamayo has used once. This shocked Tamayo so much that she wanted to cultivate you.]

【after a while.】

[I also successfully got rid of the curse on you and Muzan. Fortunately, Muzan doesn't pay special attention to the position of a small fry like you, and Tamayo also began to teach you about medicine. 】

[Because Yushiro and Tamayo haven't met yet, it's just the two of you. ]

[However, after only two months of formal training, your talent has shocked Tamayo. You actually used your own blood to create a potion that can turn others into ghosts without having to eat humans.]

[To put it simply, they are just like normal people, but they retain the power of ghosts. This is simply unbelievable, but they are still afraid of sunlight.]

[Originally, Tamayo still needed to suck a small amount of blood, but now you can just eat normally. However, in just two months, you have almost surpassed Tamayo, who has studied medicine for nearly two hundred years. ]

[Tamayo thinks you are the key to defeating Muzan, and helps you with various research on demons every day. You also ask Tamayo when you have questions, and Tamayo doesn't hide anything and gives you everything. ]

[Tamayo is very gentle to you, and you have a warm heart, so you will do your best to help Tamayo and research a potion that can completely transform a ghost into a human, the kind that is not afraid of sunlight.]

[Now your research focus has fallen on this area, because making ghosts not afraid of sunlight is actually the most difficult thing to do. You have also reached a certain bottleneck period and stay in the medical laboratory every day. ]

[Tamayo saw how hard you were working and felt sorry for you, so she sat beside you and advised you to take a break.]

[But you know what will happen in the future. If you want to fight against Muzan, you must find a way to make a potion that can quickly turn Muzan back into an ordinary human, and this is also to work hard to prevent Tamayo from dying in the future. ]

[Tamayo was always by your side, and hardly ever went out, and this went on for a long, long time. ]

[Having been with you for so long, Tamayo had always been like a mature older sister, but one night when I passed by her room, she was crying softly.]

[You know, Tamayo had a terminal illness at the time, and because Muzan told her that he could make her immortal, he turned her into a ghost. ]

[But she didn't know that she would eat people after becoming a ghost, so she killed and ate her husband and children in a state of insanity.]

【…】

"So...I couldn't do anything about the Kamado family before."

"The ghost's desire to eat people is too strong, just like the human instinct to sleep, it is difficult to suppress."

A sigh of emotion.

But since I can make this kind of potion, it seems that the reward this time will not disappoint me too much.

【…】

[Hearing the sound of Tamayo crying softly in the house, you pushed the door open and walked in. Although it was a little embarrassing, you still wiped away Tamayo's tears and gently rubbed her cheeks. Your warm hands touched Tamayo and her heartbeat quickened.]

[At this moment, you don't have too many thoughts. You just let Tamayo go to bed early and leave everything to you. You will turn Muzan into a human and let him suffer the punishment he deserves. ]

[Tamayo understands your thoughts and tells you how it is impossible for you to do this alone, and she will do her best to help you. ]

[Tonight, Tamayo blushes and gives you a gentle kiss on the cheek as a reward for your comforting her.]

[Tamayo asked you to stay with her, but you just sat by the bed and chatted with her about medical knowledge all night. Tamayo seemed to be very interested in chatting with you until she fell asleep.]

【…】

This scene also made You couldn't help but complain that they were indeed two people with great medical talent, and the atmosphere was set off here.

Is this the result?

You covered his face, feeling inexplicably speechless.

【…】

[The next day, you started medical research again, but due to insufficient data on ghost blood, even though you had excellent talent, your progress was slow.]

[You have been very distressed recently, so you pick up a wooden stick and start practicing your swordsmanship every day to relieve your sorrow.]

[Tamayo was surprised by your powerful swordsmanship and your red sword, and she felt that you had the shadow of Yoriichi Tsugakuni.]

[From now on, you will spend your days studying sword skills, researching medicine, and discussing with Tamayo from time to time.]

[Because you know, Tanjiro should come in the near future, and then according to normal circumstances, we can get Nezuko's blood sample. ]

[Next, we just need to prepare for future enemies and make some special potions to better deal with the troublesome guys we encounter in the future.]

[Several years passed like this, and Tamayo always sat by your side and studied, and even rarely went out. ]

[It seems that this is also the reason why Tamayo has not met Yushiro in the original work so far. 】

[One day, you and Tamayo felt the breath of a demon outside, and it seemed to be the breath of Muzan Kibutsuji! ]

[You look at Tamayo with a serious expression, and the two of you decide to go out for a while. ]

[You two go out. In this busy city, there are many people and it is quite lively. Not far away, Tanjiro is holding down a demon. Apparently, it was just turned into a demon by Muzan.]

[There was also a woman next to him who was injured by the ghost. It seemed that the woman was originally the ghost's wife.]

[Many people around him didn't understand what was going on and thought Tanjiro was causing trouble. The city management officer thought Tanjiro was hitting a resident and quickly asked him to let him go.]

[But how could Tanjiro let go? As soon as he let go, the demon would undoubtedly attack back, and everyone around would be in trouble.]

[Tamayo used the blood demon technique, the visual dream fragrance, to control the people around her. You asked Tanjiro to follow you. After all, you wanted Nezuko's blood, so you had to do this.]

[As long as we can create a drug that can completely transform ghosts into humans, we can actually completely solve the problem of these ghosts now. 】

[You walk over to the ghost that is being held down on the ground, pick up a small bottle of medicine, and stuff it directly into its mouth. The ghost eats the glass bottle as well.]

[Of course, it's not a big deal for a ghost to eat some glass. ]

[Then… the ghost's muscles began to shrink rapidly, its eyes widened, and its fangs returned to normal, but its gaze became somewhat dull.]

[Because this is a human who has just turned into a demon, it is still possible to suppress and remove Muzan Kibutsuji's blood, but it seems... there are still some side effects, but it will take time to observe. ]

[You let Tanjiro take the injured woman and the man who turned into a demon with you. ]

【Tanjiro asks about your identities. 】

[You told him that although you are demons, your target is Muzan Kibutsuji, and you two are doctors who are doing research on "converting demons into humans."]

[Tanjiro was shocked when he heard this. After all, his sister had turned into a ghost. This was the first time he saw hope.]

[There is no doubt that Tanjiro has decided to go with you. 】

【…】

Chapter 14: Fallen Princess

[After bringing Tanjiro back, Nezuko also crawled out of the wooden box behind Tanjiro. ]

[You walked up and touched Nezuko's head, and told Tanjiro that he needed to draw Nezuko's blood for research. ]

[Tanjiro naturally agreed. Seeing this, you picked up a relatively large needle and directly pierced Nezuko's arm, extracting 300 ml of blood as a sample. Although it was not much, it was enough for him.]

[Tamayo came back from outside. She had just finished treating the couple and told Tanjiro that they were both fine. Fortunately, you gave the potion to the man quickly, which blocked Muzan's blood erosion.]

[Tanjiro then curiously asked you what you used just now. ]

[You said it very directly. It is a "blocking drug" that can block the whole body of a person who has just become a demon from being devoured by Muzan's cells, destroying the Muzan's cells and blocking him from becoming a demon.]

[Tanjiro is very surprised that you have such a thing. ]

【At the same time, you frowned slightly, and felt the breath of the ghost again. 】

【Shua——! 】

[A handball breaks through the wall and runs around everywhere.]