"Chugaku Sogo Kenkyu Mondai-shu Suugaku" (Comprehensive Study Problem Collection for Junior High School Mathematics) Obunsha Price: ¥1500 #Obunsha #Book #Nature/Mathematics There is a slight crease on the cover. There are three red circles as shown in the second photo, but no other writing. It has become black as shown in the third photo, possibly from being rubbed in a bag. Despite the above, the contents are clean. These are good problems, so it's a shame to throw it away, so I'm putting it up for sale.