The obi is included. There are no noticeable scratches or stains, and the condition is good. ◎ Ships from "Kanto (Saitama)" ◎ Ships within 24 hours of purchase ◎ "All items are anonymously shipped with free shipping" (You can receive the item without the seller knowing your address, name, or phone number. Trackable shipping method, seller pays shipping) ◎ "There are no writings unless otherwise noted," so please rest assured. (Books with writing will have the extent of the writing, such as "writing on page ○," described in the product description.) ◎ If there are any defects not mentioned after purchase, please contact us and we will address them. "Introduction to Mathematical Models for Data Analysis: For Analysis That Grasp the Essence" Takahiro Esaki Price: ¥2600 #TakahiroEsaki #Takahiro_Esaki #book #nature/mathematics