I know fuck-all about this series, except for the fact that images with just random characters in it keep popping up where people come up with the most creative ways they can to tell the characters represented to die horribly. (Including several with just some random girl not doing anything with no wiki page to explain who she is.)
... Sounds like a nice, relaxing slice-of-life to me!
Why did Slaine stop Inaho from killing the same man that blatantly admitted to being the mastermind behind the assassination of the princess? That was probably the stupidest move I've ever seen from a character.