This is the 2019 Aohom (Blue Book) for the humanities at Hokkaido University. Price: 2310 yen Contains 3 years' worth of problems. The explanations are very thorough, so many people use it in conjunction with the Akahom (Red Book) (I did too). I haven't checked it in detail, but there might be some pencil markings, so please check before you solve the problems.