Chun-sama, Request for you. Thank you for your combined order request. Since separate shipping would incur extra shipping costs, please purchase the items individually. The Kodomo Challenge Hopp (3-4 year olds) picture book set, January to December, has already been sold. I also have Hikari no Kuni (used for 4-5 year olds) listed, which is also a good educational picture book, so please consider it. I will offer a discount if you are interested, so please comment. The thickness seems to be okay, so I will include a bonus. If you like, as a bonus, please purchase individually due to shipping costs, but I apologize for the inconvenience.