Other Worlds: Arifureta Anime

Sensei levels up to Goddess of Fertility

Arifureta Episode 10 sees an army of Sixty thousand monsters sent by 'the demon lords' to exterminate a Social Studies Teacher who, along with her students, has been unwillingly transported to another world. While we know that a number of her students are 'volunteered' to fight for the Empire, Sensei has apparently escaped to a mountain village with a handful of students where she is teaching the locals modern agriculture.

She pleads with Hajime to save these people and he eventually agrees, though the speech he gives the villagers levels her up from Aiko Hatayama, Social Studies Teacher through Lady Aiko, Aiko - Goddess of Agriculture, Aiko - Goddess of Plenty, to Aiko - Goddess of Fertility (you dont see this in the subtitled version, but its the unsubtitled third time he describes Aiko in the same speech and moment she blushes in embarrassment).
Its also the moment she must realize that (a) not all her students are going to survive to make it home from this Isekai, and (b) Hajime is prepared to personally kill his fellow students to keep her alive.

This is a significant change in the Anime because when the dust has settled on this massacre, and her student Nagumo Hajime-san with the Aid of his OP harem is done slaughtering this army, and dragging its 'leader' back to his Sensei we find it is one of her other wayward students.
The 'demon lords' have concluded from the information they got from her wayward student about this Teacher concerned them so much that they sent him back to murder her and erase her village from existance with an army of sixty thousand monsters.

So what the hell is it about a teacher that could scare a demon lord?
If modern Agriculture is offensive, its to civilizations that prefer to control and manipulate a poorly educated hungry populace.
Its more than likely her lack of loyalty to the Monarch that summoned her and her students to this other world, and any of her objections to the sacrifice of her students to defend it with their lives.

Though most might not understand the significance of this episode, by the end of it Hajime has effectively declared Sensei his prefered political candidate as the next Empress of this Isekai Empire.

Hatayama Aiko: Normal Human, Lawful; Age 25; female; Str 5, Int 12, Wis 9, Dex 5, Con 10, Cha 9; Skills: Appraisal (plants), Teaching, Science (Social Studies), Science (Modern Agriculture); Other Aliases: Sensei, Lady Aiko, Aiko - Goddess of Agriculture, Aiko - Goddess of Plenty, Aiko - Goddess of Fertility.