Comments of Hataraku Maousama! High School!

Chapter 12 - 19 should be posted in the "Hataraku Maousama!" manga.
>Looks like that's the end! It was pretty lengthy for a LN advert.

Read the mangaka's other work first (Hataraku Maousama!) If not, stop after chapter 11 on this manga. Chapters 12-19 is from the original work and if you read it now you will have spoilers if you read the main work after this one.

It is also easier to understand this manga after reading the original manga. Especially if you read the original's chapter 27 and on before this manga's v2c8