This is a study planning notebook jointly produced by QuizKnock, a knowledge group led by University of Tokyo quiz champion Takuji Izawa, and Gakken. I bought it but never used it, and have been storing it. I am selling it because I don't expect to use it. I will protect it from water damage and ship it anonymously. Please purchase only if you understand that it has been stored at home and has been inspected by an amateur.