Thanks for the chapter!
Poor slaves, after being touched by his kind words are immediately dropped down by his actions. Something tells me with all the flags Yuuto is going to lose any reason to return to Earth. Especially since his dream is to have a 100 girl harem which is only acceptable where he is. That ninja seems to be the emotionally full charge type that jumps to conclusions and action without thinking or hearing things through. I thought Emilia's skill only allowed her left hand to completely drain whatever she touches, so what's with the giant, demonic, armored arm? Or is the arm's large growth due to the amount of mana drained? Arm would explain why Yuuto is so cautious of her and thinks her ability to handle adventurers so high. After all, just mana draining wouldn't hinder completely physical attack type adventurers who don't use magic at all and a simultaneous multi-directional magic attack, like fireballs coming from all sides, could allow a few to hit even if she did manage to spin around and neutralize most of them.