人狼サバイバル 1 絶体絶命! 伯爵の人狼ゲーム

Probably not recommended if you want a typical "traitor game" book, but...

I'm not sure I'd recommend this book to someone who (like me) expected something typical in the psychological/traitor game genre. You know, interesting rules, smart thinking, intrigue and/or lots of feelings. You'll find pretty much none of that here. The characters are normal kids, not genius detective prodigies. And yes, it's a death game, but since it's written for kids, desperation levels will be rather low at almost all times despite the extremely high stakes.

Instead, what you will get is

Entertaining for a children's novel

I found this children's book rather entertaining. The children have to "play" a game where one member is an imposter (werewolf) that they have to identify. If they fail to identify them, then one person gets killed. So as you can imagine it's a thriller, but for a children's book the stakes are rather high! So I found myself wanting to read on to find out how they resolved this.

I guess if you like shows like Liar Game then you would find this interesting.

The grammar isn't too bad, someone wi