神秘の洞窟探検隊Kanade herself is top-notch material, and this brings out various expressions that weren't in the main story. I think art lovers will absolutely adore it. However, I may be in the minority, but for science-minded people like me who love illustrated books, it's a sad reality that the close-up images of body parts are gradually decreasing. Since we're paying extra, it would be perfect if there were detailed images of various body parts that weren't in the main story (lips, nape of the neck, armpits, areola, nipples, navel, clitoris, urethra, vagina, etc.).