He didn't feel like he would need many more things in such a world, so he didn't know what else he should ask for. He didn't feel any interes in asking for power, since it would feel like he was cheating and he had promised his family to live a good and honest life. As such, he continued to think until he came to a decision. Even if he couldn't ask for direct power, he could still ask for a small boost.
Evolution System in High School of The Dead
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