Slayer: Look directly at the Seraph, standing on the sun

Chapter 690 Thank you, big brother!

"Thank you, big brother! I did it! I really did it!" Nohara Rin's soul rushed excitedly toward Zhang Hai's soul, expressing her joy and gratitude.

Zhang Hai's soul also revealed a relieved smile. He knew that Nohara Rin had enormous potential, and with proper guidance, she would definitely become an outstanding user of spiritification techniques in the future.

"Alright, Lin. Now try to let your soul return to your body," Zhang Hai instructed.

Rin Nohara's soul circled in the air a few times before slowly descending and returning to her body. She opened her eyes, her face still flushed with excitement.

"Big brother, this feeling is so amazing! I've seen so many things I've never seen before!" Nohara Rin exclaimed excitedly.

“Very good, Lin. Now try again, without my help, to separate your soul from your body on your own,” Zhang Hai encouraged.

Nohara Rin nodded, closed her eyes again, and tried to feel her soul. She concentrated, wanting her soul to leave her body again. However, this time, no matter how hard she tried, her soul could not truly separate from her body.

"I...I can't do it..." Nohara Rin opened her eyes in frustration, her little face filled with disappointment.

Zhang Hai knew the reason. Although Nohara Rin was exceptionally talented, her chakra reserves were still insufficient. The Spirit Transformation Technique consumed a huge amount of chakra, and she was not yet able to perform it independently.

"Lin, did you feel anything?" Zhang Hai asked.

Nohara Rin nodded. "I feel... like there isn't enough strength in my body to push me out."

“That’s right, Lin. This is chakra. The Spirit Transformation Technique requires a large amount of chakra, and the chakra in your body right now is not enough to support you in completing the soul separation on your own,” Zhang Hai explained.

Rin Nohara's eyes dimmed slightly. She hadn't expected that she wouldn't be able to complete the Spirit Transformation Technique on her own due to insufficient chakra. She had thought she had succeeded, but now she felt defeated once again.

"It's alright, Lin," Zhang Hai comforted her. "This is only temporary. As long as you train hard and strive to increase your chakra reserves, you will definitely be able to fully master the Spirit Transformation Technique in the future."

Hearing Zhang Hai's encouragement, Nohara Rin's eyes blazed with renewed fighting spirit. She nodded vigorously, her small face filled with determination, "Yes! I will definitely train hard! I will definitely work hard to increase my chakra and strive to master the Spirit Transformation Technique as soon as possible!"

"Go for it, Lin!" Zhang Hai encouraged her with a smile.

Seeing Nohara Rin regain her energy, Zhang Hai felt a sense of relief. He knew that although this little girl was still young, she possessed an indomitable spirit and unwavering determination.

He took Rin Nohara home and then went straight to Tsunade's laboratory. He knew that although the Third Hokage had assigned him the task of "helping Tsunade improve the medical system," Tsunade was definitely still "exploiting" him.

When he entered the laboratory, Tsunade was not there. Only Shizune was sitting at the lab table, intently studying a thick book on medical ninjutsu, a pen in her hand, scribbling on a piece of scrap paper beside her. Fine beads of sweat covered her forehead, but her eyes were unusually focused.

In front of Shizune were several glass containers filled with an unknown liquid. She was conducting simulated training in medical ninjutsu, attempting to extract medicinal herbs and prepare potions. Although her movements were somewhat clumsy, they were meticulous, indicating that she was mastering the technique quickly.

"Mute?" Zhang Hai called softly.

Hearing the sound, Jingyin abruptly looked up. When she saw Zhang Hai wearing a mask, a surprised smile instantly appeared on her face.

"Uncle Zhang Hai!" Shizune called out happily, then ran excitedly to Zhang Hai's side. "You're here! Tsunade-sensei taught me so much today, I feel like I'm improving so fast!"

Her eyes were filled with admiration. "Tsunade-sensei is so amazing! She teaches so diligently and is so gentle! Unlike you..." She was halfway through her sentence when she suddenly realized she had let something slip, so she quickly covered her mouth and stuck out her tongue in embarrassment.

Zhang Hai smiled helplessly. It seemed that Shizune had already been subdued by Tsunade.

"Where is Lady Tsunade?" Zhang Hai asked.

"Tsunade-sensei went to do an experiment," Shizune replied. "She said she would come over tonight to check on my training progress."

Zhang Hai nodded. He knew that Tsunade was putting pressure on Shizune, but also trying to motivate her.

"Jingyin, practice hard," Zhang Hai instructed. "I'll come over to check on you tonight." He emphasized the words "I'll come over," his eyes carrying a meaning only Jingyin could understand.

A bright smile appeared on Shizune's face. She knew that Uncle Zhang Hai was hinting to her that he would also help her practice secretly at night so that Tsunade wouldn't find out.

"Yes! I will definitely practice hard!" Shizune said firmly.

Looking at Shizune's determined eyes, Zhang Hai felt a sense of relief. He knew that Shizune would receive the best training from Tsunade. As for himself, he could only continue to play the role of the "exploiter," silently paving the way for these children.

After saying goodbye to Jingyin, Zhang Hai went to Tsunade's laboratory again. This time, he was prepared to die. He knew that Tsunade would not let him off easily.

As he pushed open the laboratory door, a pungent odor assaulted his nostrils. A thin layer of green mist filled the room, mixed with a nauseating, fishy smell. Zhang Hai was startled and immediately held his breath, activating his chakra perception.

In the center of the laboratory, filled with toxic fumes, Tsunade was intently staring at a petri dish emitting green bubbles. Her face was smeared with an unknown liquid, and her forehead was covered with fine beads of sweat, but her gaze was unusually focused, as if she had not noticed Zhang Hai's arrival at all, nor the toxic fumes surrounding her.

"Cough cough..." Zhang Hai couldn't help but cough a few times because he was choked by the poisonous gas.

Hearing the cough, Tsunade didn't even look up, her tone cold and indifferent: "What are you doing here? Can't you see I'm busy? I don't have time for you, get out of here!"

Zhang Hai sighed helplessly. He knew Tsunade was deliberately trying to intimidate him. He took out the mission document assigned by the Third Hokage from his pocket, walked straight to the lab table, and threw it on the table.

“Lady Tsunade, this is the mission document personally assigned by the Hokage,” Zhang Hai said in a deep voice. “If this mission is not important to you, or if you do not need my assistance, then I can leave now.”