Eren waited for a while, clenched his fists, but felt no change.
The feeling of weakness that had been there since he entered this body was still there.
"Why haven't I gotten stronger?"
[If you want to feel the effects of the spirit drops, please use the information you have obtained about the spirit to control your spirit.
Even though Eren was unhappy because he had already guessed this before the system said it, he strangely felt like he was a less irritable person than before.
Silently accepting that the system would not directly help him increase his physical strength, he closed his eyes as instructed in the information in his consciousness and tried to feel his spirit.
Strangely, the phrase "feel your soul," which had felt like a meaningless string of words just moments ago, now made sense.
After a simple attempt, Eren was able to feel his soul, which led him to another question.
"Hey, system. Why is my soul just like my body—a child?"
[Your soul underwent a reset when it connected to the system. Your soul's new form is a healthier form that accepts the system's existence, and this has some advantages for you as well: Your new soul has not yet completed its development, so if you purchase the spiritual genetic modification potion from the system store, you can decide how you will look when you become an adult. The spiritual genetic makeup you currently possess is the most perfect genetic sequence in this world. My advice is that even if you obtain the spiritual genetic modifier from the store, you should only make adjustments related to your outward appearance.]
"Okay... Is there anything else you should tell me but haven't?"
[When your spiritual absorption range increased, I sensed a very powerful entity within your range. Please find a safe shelter as soon as possible.]
Upon receiving the system's warning, Eren stopped messing around with the system and made it his top priority to become strong enough to defend himself against ordinary ninjas.
He knew that the magic books he had received from the system were from the Bleach anime and had a general idea of the types of powers they contained, as he had watched Bleach much later in life compared to Naruto.
Of the spells he had learned, two were attack spells and two were restriction spells.
After thinking for a moment, he decided that the only spell he could use if he found himself in a truly dangerous situation was the number 4 attack spell. This attack spell concentrates spiritual power at the tips of the fingers and releases a high-intensity lightning spell.
If this lightning-type kido spell were a ninjutsu, it would be classified as at least B rank among lightning-type ninjutsu. Although it was a bit simple in terms of functionality, the spell's power was entirely dependent on the user. And most importantly, you could use this spell silently and turn it into a magnificent assassination weapon.
Thinking that if Eren used this spell correctly, he could even take on a Chunin or Jonin, he immediately opened the system library and began reading the Pale Lightning training guide.
The fact that it was a thin book of about 10 pages gave Eren a little hope, but the words at the top of the first page took that hope away.
"Estimated training time for a healthy adult who has successfully learned Hado No. 1: 1 day. To be able to use this Kido spell, you must have consumed at least 5 spirit drops. Otherwise, both the learning and application difficulty of the spell will increase significantly. Moreover, even if you learn it successfully, you won't be able to use it more than once... The system... ah, never mind, it's already written clearly, and if I ask you, you'll just repeat the same things."
Eren checked the 4th Bakudo spell without hesitation and found the same style of text there as well.
Finally, after finding a place to sit among the tree roots where he could practice, he began to learn the Hado no 1 spell.
After working for about three minutes, Eren began to freely move the spiritual energy in his body with the help of the information implanted in his mind, and then moved on to the last part of the one-page guide.
At first, he extended his finger toward the roots on the other side, gathered a small amount of energy at the tip of his finger, and released it when the resistance increased, but the resulting effect was not sufficiently satisfying.
As he continued to try and fail, he remembered the movements Ichigo's father had made when using this spell.
He bent his fingers as if striking the air, gathered the energy ball on his thumb, applied resistance to the energy ball with his middle finger, and released it suddenly.
From the outside, it looked as though a three-year-old child had used the force of a flick to carve out a hollow in a thick tree root, but for Hashirama, who was secretly watching the events unfold from the top of a distant branch, the situation was far from simple.
-------Ten minutes earlier