Eren sat down in the space between the roots of a large tree in anticipation of a possible ninja attack and waited for the countdown to end.
Based on the unreliable girl's words, Eren guessed that this was Naruto's world, but he had no idea what era he was in or why he was there. However, based on the last clue the girl gave him, he guessed that he would soon be in trouble.
After the 2.5-minute countdown ended, numerous system screens appeared before Eren's eyes, listing the items he had obtained.
[All collected souls have been successfully processed]
[You have been identified as Level 0. All collected experience points are being used...]
[Congratulations, you have leveled up]
[Congratulations, you have leveled up]
[Congratulations, you have leveled up]
[Congratulations, you have leveled up]
[By reaching Level 1, you have obtained the Hado No. 1: Thrust training method and basic spiritual energy manipulation]
As Eren read the text about the rewards he had earned, he gained some knowledge about how to manipulate spiritual energy, and a small system notification appeared at the top of his field of vision, moving along with his eyes.
[A new book has been added to your library. Please check it out]
Eren waited until he felt a sense of relief in his mind before paying attention to the notification. The moment this feeling arose, he could tell that the process of transferring information to his mind had ended.
"Hey, system. I like this direct information transfer process to the mind. If you have a store function like the Japanese who migrated to isekai, could you please inject all the advanced medical knowledge into my mind? I'll pay you later."
...
"I promise."
[Please collect all your level-up rewards before communicating with the system]
"Don't tell me the system mainboard is overloaded because of a few notifications. You're too advanced for that."
[Energy-saving mode disabled]
[These are not random system notifications. Please collect all your rewards as soon as possible. As the host, you should have no more than one pending reward notification to communicate with me. Reward notifications operate in defiance of cosmic laws, which is why they cause extreme levels of consumption] (cut off at the end)
[Energy-saving mode enabled]
While Eren was reading the system's messages, the system's artificial intelligence's speech screen suddenly closed again, but fortunately, Eren had already understood what the system was trying to say.
[By reaching the second level, you have earned Bakudo No. 1: Restrain training method and basic martial arts training guide]
[Two new books have been added to your library]
[By reaching the third level, you have earned Hado No. 4: Pale Lightning training method]
[One new book has been added to your library]
[By reaching the fourth level, you have earned the Bakudo No. 4: Slithering Rope training method]
[One new book has been added to your library]
After turning off all level-up notifications, Eren told the system he wanted to see his library, and a hologram of a three-shelf bookcase floating in the air appeared before him.
Two of the shelves were dedicated to Hado and Bakudo spells, while the other shelf was labeled "basic training methods."
When he tried to pick up the books, he was surprised to feel as if he were actually holding a book in his hand, but it was obvious that it was a hologram because the book was slightly transparent.
Eren was probably sending signals to the thalamus region of the system's brain to create a realistic tactile sensation.
After a brief hesitation, Eren picked up the basic martial arts book and opened it.
After reading for a few seconds, he furrowed his brow and began flipping through the pages quickly, then smiled as he read one of the entries on the last page.
"In short, when fighting a humanoid creature, folding your fingers inward to form a fist and using that fist in attacks is the foundation of basic martial arts... This is the most basic and stupid martial arts tactic I've ever seen! Can I return this book? If possible, I could trade it for experience points."
[There is no option to return or trade for level-up rewards. But if you like, I can destroy this book.]
"No, no, leave it. Actually, you know what? I... immediately... need... the... basic... breathing... training... guide. I just forgot how to breathe."
[According to my data center, humans need to use their lungs to breathe. Please contract and expand your lungs, host.]
"Wow. Hahaha. You're a genius. I almost choked."
"Anyway. Where are those spirit drops you mentioned? Since I don't feel stronger after leveling up, I probably need those things to get stronger."
There was no response from the system to Eren's question, but three drops appeared before his eyes. The drops were at least ten times the size of a normal water drop, and the three drops were almost enough to fill Eren's palm.
After staring at the three droplets, which had an oddly appealing, light blue color, for a moment, Eren asked the system why one droplet was missing. The response he received was that it was because the system had temporarily exited its power-saving mode.
Although Eren wanted to complain about this, he didn't want to argue with a low-intelligence AI over something that had already happened.
More accurately, he couldn't take his eyes off the soul drops in his hand.
He stopped hesitating and stuffed the drops into his mouth at the same time, experiencing a pleasure almost as intense as an orgasm.
Though this moment of pleasure lasted only a few seconds, when Eren opened his eyes, the world seemed to be made up of much more pleasant colors.