This is a Japanese confectionery called Ichigo Daifuku. Sweet red bean paste and a whole strawberry is coated with a sticky rice cake.
It is mainly sold in certain seasons as strawberries grow from January to May in Japan.
This a 2-pack of Ichigo Daifuku いちご大福 was 300 yen at a shop.
You can find it at supermarkets, department stores and confectionery stores.
Sticky rice cake is soft and a bit sweet. Yummy!
Originally a whole strawberry would be inside.
This Ichigo Daifuku was 270 yen. (including tax)
These days many shops put the strawberry on the rice cake because the shops and people think that when the strawberry is on top, it is more instragrammable.