A new Yamazaki Lunch Pack variety uses Crown Melons, which is a famous brand of muskmelon from Shizuoka prefecture. I just looked on the internet and they appear to go from 30 to 60 dollars a piece, but I think they can probably be found for much more. In any case, this set contains one Crown Melon cream sandwich and one whip cream sandwich and is categorized as part of their sweet series. ヤマザキ クラウンメロンクリーム
Photo is a web capture for explanatory purposes, copyright belongs to the company.