For those interested in Yumicore For those who want to deepen their understanding before starting online For Yumicore beginners ① A practical book specializing in body shape improvement, introducing specific methods for creating a waistline. Book only. - Title: Kubire Kaachan no Daseru Karada (Mother's Body That Can Achieve a Waist) - Author: Yumiko Murata ② "Shitahara Petanko Kami Buresu" (Flat Lower Abdomen, God Breath) by Yumiko Murata Price: 1,400 yen ③ "Kubire Kaachan no Hone kara Body Make 3DX BODY" (Mother's Waist Body Make from Bones 3DX BODY) Yumiko Murata Price: 1,500 yen ※ DVD attached to the book