>>31080510Sorry I forgot to getting to that, you can get this one which includes both polka sketch 1 and 2 (or you can get both separately if you really want to, but putting them together when shipping them with Buyee will cost you iirc)
https://www.melonbooks.co.jp/detail/detail.php?product_id=1547698In regards of them appearing as "In Stock: In Stock" (thanks Google Translate) I'm a bit confused too, but if you can put it in your cart it's probably good to go.