Koguma-kai Hitori Tokkun 83rd Edition Set Used for basic skills development from the fall to spring of the new school year. Set of 83 books. Please check the numbers in the photos. *There are two copies each of 30 Migi Hidari and 43 Tsuri Ai, so there are actually 81 types. Since I used copies, the inside is clean with no writing (please forgive any oversight). Some covers have stains. Some books are cut, and some have been removed from the spine. Please check the photos. *For 92 Shiho Kara no Kansatsu, the spine is torn when removed from the cover, but there is no problem in solving the problems. As a bonus, I will include a Koguma stringing set and an interview DVD. Thank you for your understanding. Thank you for looking.