Answer about A silent voice, Might contain small spoilers
I read it online so I can’t be sure of it but I believe it is.(First volume elementary school) I read the manga, I don’t know which one,manga or novel(if there is one), you are proposing for the book club. And I can’t help you with the difficulty since I read it in English. There might be some complicated stuff in it. Mostly complicated themes. If you think the first part is too depressing then you shouldn’t propose the book. This manga as a lot of intense emotional moments in it. It’s probably more pack with emotion than the begginer bookclub is used to but if people wants to read it you could just find some exemple pages somewhere.
Oh! and small trigger warning because some themes in it might be hard for some people. for example intimidation, bullying, social isolation, suicide, violence against children, etc
But again I found it to be a super nice story. I suppose you could just propose it and had a notice to it I guess?
I do hope I was of some use