“Well, this time I’ll overlook it. But, there won’t be a next time, okay?” (Hajime)

“… … For the love of god. It is me who has become senile. For me to kick the butt of a dragon in front of my eyes…” (The merchant that threatened Hajime's girls)

“Kick the butt of a dragon” is a proverb of this world, it referred to the Ryuujin race and dragons. They boasted their defensive power as an impregnable defense because of their whole body covered by scales, excluding their eyes and mouth, the butt hole that wasn’t covered by scales was their only weak point. Because of their high defense, as they were deep-sleepers, they wouldn’t awaken once they fell asleep, but they would wake up at once, once their butt that was their weak point received stimulus, and became enraged like raging fires. A long time ago, it was not known why that was done, but the fool was completely crushed. From that, it became the meaning of someone who is foolish enough to purposely disturb someone that was harmless as long as they weren’t disturbed.