This is from 2025. It's a problem set. I used it after purchasing it. There are no folds, and there are no noticeable scratches or stains, so it's clean, but there may be small signs of use on the cover and back. Inside, the columns for "1st time," "2nd time," etc., have been marked with circles (〇) or crosses (✕). There are no lines drawn on the text. Also, please purchase only if you understand that it has been stored at home. The serial code for the video bonus for purchasers has been used, so it has been cut out. Original price: 3800 yen ♡ I will pack it carefully. ♡ Immediate purchase OK