Plot
This is fantasy and not an isekai. Humans use something called Aura (and weapons) to fight and Demons use Magic. MC works as an assistant to the four generals of demon army. He is really really good at managing office work and is the favorite of everyone in demon army. But he cannot use magic for some reason. and he is fired due to jealousy. As he is roaming in a forest aimlessly, he happens to save a girl from a monster. our female lead who is also the daughter of the nearby village's mayor. The rest of the anime is him settling into the village, learning that he is a human and using the Aura to become strong. The story mostly deals with how he tries to make peace between demons/humans, because despite being human, he cannot turn against demons who raised him. The plot is driven by family drama and/or jealousy. Ofcourse, things get resolved by talk no jutsu multiple times.
Characters
MC
becomes really OP after learning Aura. says "I don't want anyone to die". Honestly, it is kinda embarrassing for a grown 33 year old soldier to say unrealistic dialogues like that. He's been working in the army literally since he was a baby, and saw many many people die all these years. But whatever, it is my fault for watching anime made for kids and expecting mature characters. Anyway, everyone loves him. there is a main female lead, but there's also some sparks between 3 other female characters. It didn't become a harem in this season, but there is a strong possibility of it becoming a harem in the future.
Every other character is more or less there to be impressed by MC. The most interesting character by far is the demon lord himself.
Demon Lord
His appearance is a reflection of oneself. So, to a weak person, he looks like a child. to a strong person, he looks like an absolute demon dragon with horns and everything. He speaks like he sees through everyone and knows everything. he only appears 4 times and does nothing but sit on his throne and speak, but still makes us feel his presence.
The Art/Music are good enough to not distract you. Although, there seems to be a large focus on breasts. In fact, half the scenes seem to have breasts as the main focus whenever there's a female character on screen.
This is not a perfect series, but worth watching once. The story, romance, fights all move at a fast pace, so you never get bored.
