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Having turned this page over, Kireina moved David and his group of dorks back to the main city where David began his new adventure as a man with a new life, now he had not to worry about anything else because Kireina was going to take care of the world on his steed. Nonetheless, he felt the necessity to still grow stronger and pay back her help, she felt like it wasn't necessary and tried to stop him several times when they were discussing.
"I will still grow stronger to help you out, Kireina!" he said.
"You shouldn't. I am actually a villain, you know? I killed everyone you loved." Said Kireina.
"I don't care… you've redeemed yourself!" said David.
"You're an annoying kid. Which part of "I don't need your help" you don't understand?" she sighed.
"All of it! I will help out!" he said.
Check "The Protagonist's Sister Is Actually the Strongest"!