This is a set of 12 "Hatenna? Hakken! Book" textbooks from Benesse's 2017 edition of Challenge 2nd Grader materials. These books have interesting and informative content that sparks curiosity, and my children read them many times. Please see the photos of the table of contents. There are folds, creases, and tears on the covers and corners, but the inside is relatively clean. The stickers and attached supplements have mostly been used. If you'd like, I will also send the pictured notebook, mini-ruler, and mystery book. The notebook is unused, but I erased the name with correction fluid. If you'd like to split the shipment into two and send it via Yu-Packet Post, I can change the price to 600 yen, so please let me know before purchasing. I am also selling other reference books. There is a possibility of a discount for combined purchases, so please feel free to inquire.