Until now I've never had the pleasure of reading such a wonderfully crafted story with equally well rounded and lovable characters. The world building is fantastic and carries with it magnitude by how it effects the main characters, which I've found lacking in other stories in the Isekai genre.
Moreover, the art really compliments the character's personality. While it may not be the most stylized, it really is pleasing to the eye. Character development in this story is something I've adored from the beginning, and no other manga has immersed me so deeply into the lives and emotional troubles of its characters, nor has any manga brought out such a multitude of emotions. I'm talking amusement, disgust, joy, worry, discomfort, and relatability, and everything that may fall in between.
Overall I rated this manga a 10 because I truly adore its characters and believe their development in regards to the world and circumstances they are brought up in is superb, and has deeply touched me in some moments. I hope this short ramble can entice you to give this manga a shot and hopefully it will bring as much joy and entertainment to you as it did to me.

Regarding the ecchi tag, there are certainly some uncomfortable imagery if you dislike lolis/teens, but if you can look past your own age I am positive you can see the in-story relationships for they are.


TLDR
Story: Great world building and good pacing.
Art: Very pleasant and well done, if not somewhat generic.
Characters: Equally as lovable and hate-able. Great development overall.
Enjoyment: One of my all-time favorites, and eagerly awaiting more chapters.