Really good, i like it and i got my little sister a set of them for her 12th birthday and she enjoyed them. I think it is probably appropriate for secondary school students or older. I think it is designed for teenagers. And probably no younger because as the series progresses it gets more sexual. But one and two is probably fine for 10+ though. Theres a bit of swearing but not alot. Anyone younger typically wouldn’t understand it really and its got kissing and stuff. Volume 5 is probably for 14+ because its a bit graphic or if 12 and 13 understand and know about things like sex and condoms it should be fine.