Reddit reviews DORAEMON Doll baked a box in -custard 9pieces ＆ Sponge cake baked 7pieces-Tokyo Souvenir Gift in Japan Omiyage
We found 2 Reddit comments about DORAEMON Doll baked a box in -custard 9pieces ＆ Sponge cake baked 7pieces-Tokyo Souvenir Gift in Japan Omiyage. Here are the top ones, ranked by their Reddit score.
9pieces in one box
> ドラえもん 人形焼 ~ カスタード ~ ＆かすてぇ~ら焼 カステラ ドラエモン
> https://www.amazon.co.jp/dp/B01HLVFT3S/ref=cm_sw_r_cp_apa_u9z1BbVS35QYM
FYI this specifically says they have custard (カスタード) in them. It might be the closest to what you're looking for. Snacks here are very seasonal and/or limited; you might find a snack you like once, only to return to the same place a short time later to find it's not there. Rotating out flavors and such is VERY popular. Can't tell you how many times I've found potato chips I love, only to never find them again.
I suggest looking through this Google search to see if you see what you bought.
Worst comes to worst, custard-filled castella cake (sponge cake) is a popular item here. I know custard momoji is pretty much the same thing you've described.
Would these happen to be them?
ドラえもん 人形焼 ~ カスタード ~ ＆かすてぇ~ら焼 カステラ ドラエモン https://www.amazon.co.jp/dp/B01HLVFT3S/ref=cm_sw_r_cp_apa_u9z1BbVS35QYM