Cheng Mo put the last batch of ordinary medicines into his spatial storage, but his movements didn't stop.
He gazed at the neatly stacked medical supplies in the corner of his spatial storage, his eyes calm, but his thoughts had already drifted deeper.
In his mind, a bolder and more long-term plan gradually took shape.
The name naturally popped out as he pondered how to completely cure his younger sister.
That was Lady Tamayo, who had broken free from Muzan's control and had dedicated hundreds of years to medical research, seeking to turn Demons back into humans.
Her medical expertise, especially her research into blood and the essence of life, had long surpassed the era of the Demon Slayer World and, in some aspects, might even touch upon areas that modern medicine has yet to delve into.
His younger sister Cheng Xingtong's leukemia was so tricky even with modern medical conditions in this world, so perhaps... there was a glimmer of hope with Tamayo?
Even if it was just medicines or therapies that could effectively control the illness, significantly extend her lifespan, and improve her quality of life, that would be enough.
But this idea carried immense risks.
Firstly, how to gain Tamayo's trust?
Secondly, asking her to analyze the blood of a human from another world and develop medicines—the difficulty and uncertainty involved were considerable.
Finally, what would be the price?
What Tamayo most desired was to research the blood of higher-ranking Demons, especially the Upper Rank Demons and even Muzan's blood.
Cheng Mo slowly clenched his fists.
The power of Thunder Breathing silently circulated within him, bringing a calm confidence.
Total Concentration: Constant had become his norm, all sword forms were skillfully mastered, and wielding the reforged nichirin blade "jingzhe (awakening of insects)," he had even initially mastered the defensive and offensive Lightning Release Armor.
Although his Chakra reserves were still a weakness, he was confident that he was in no way inferior to a Pillar-ranked swordsman of the Demon Slayer Corps, and perhaps... he might even have a fighting chance against an Upper Rank Demon!
And the bargaining chip he possessed was something Tamayo craved but couldn't obtain—systematic, cutting-edge, and far beyond-its-time medical knowledge, especially profound theories about blood diseases, cells, and genetics.
This might greatly advance her research.
And the help he could offer—obtaining blood samples from Upper Rank Demons, and even Muzan—was an irresistible temptation for Tamayo.
"It's worth a try."
Cheng Mo murmured, his eyes sharpening.
For Xing Tong, no risk was too great.
He immediately took action.
First, the samples.
He needed to bring Tamayo the freshest, most complete blood samples of Cheng Xingtong, including whole blood, serum, and any potentially diseased cells.
He immediately booked an appointment at Haicheng's top private hospital, leveraging Liu Yu's family connections to ensure absolute confidentiality and efficiency.
In the sterile blood collection room, he accompanied his younger sister, Cheng Xingtong.
"Brother, more blood draws?"
Cheng Xingtong asked softly, a hint of habitual timidity in her voice, as she watched the nurse take out the blood collection needle.
"Yes, this time it's for a more comprehensive check-up. We're using new equipment, so we need a bit more sample."
Cheng Mo's tone was gentle, his hand resting lightly on his younger sister's slender shoulder. A very faint trace of Chakra, imbued with soothing energy, quietly passed into her, easing her tension.
"It'll be over soon, and it won't hurt."
He watched the dark red blood slowly flow into the collection tube, his heart heavy.
This blood carried his younger sister's hope for life and the family's heavy burden.
Now, he would take this hope to another world, seeking a miracle.
He requested multiple tubes of blood, including whole blood, separated serum, and samples of diseased cells preserved with as much activity as possible.
Afterward, he personally operated, using a pre-prepared small medical cooler with precise temperature control, carefully storing the most crucial active samples inside and setting a constant low temperature.
Leaving the hospital, Cheng Mo went to the school's electronic reading room.
The medical information he had previously provided was more basic and practical. This time, for Tamayo, he needed something deeper and more cutting-edge.
He searched and downloaded a large number of reviews and papers from the database on the latest research progress in hematological diseases, cell biology, molecular genetics, targeted therapy, and even gene editing technology.
The content was profound and obscure, far beyond what he had given to the Butterfly Mansion before.
He carefully filtered these materials, directly printing some. For the most critical parts, he even personally transcribed them into Japanese on special waterproof paper, ensuring an infallible translation.
After completing all this, Cheng Mo returned to the villa's basement.
"These... should be able to demonstrate my sincerity and value."
He looked at the thick stack of organized materials, pondering.
For Tamayo, this knowledge was undoubtedly the key to opening the door to a new world.
He placed the cooler and the knowledge materials separately in a prominent position in his personal space, distinct from other trade goods... The morning light of the last day streamed through the villa's high windows, casting several bright spots on the floor.
Cheng Mo finished his almost masochistic training and quickly washed up.
He first went to the new home, which was mostly settled and ready for occupancy.
Today was Saturday.
His mother was wiping down the brand-new furniture, while his father was on the balcony, examining the plants that needed tending, a look of dreamlike satisfaction and carefulness on his face.
Cheng Mo joined them for a simple lunch.
At the dinner table, he calmly mentioned: "Dad, Mom, the follow-up for that project requires me to go out for a few more days to follow up. The place is remote, and the signal might still be bad, so don't worry."
His mother's hand paused, a flicker of worry in her eyes, but seeing her son's steady gaze and the tangible material changes from before, she finally nodded: "...Oh, go. Just be sure to stay safe! Xiao Mo, everything is good at home now, you don't need to worry."
His father silently ate a few mouthfuls of rice and mumbled: "Just be aware of what you're doing. If something happens... call us... call that boy Liu Yu."