The seasonal menu "Heart Chocokuro" is on sale until February 14th at each St-Marc Cafe store. The price is 190 yen (excluding tax).
This is the signature menu "Chocolate", which is made by wrapping chocolate in crispy croissant dough, and is baked into a cute heart shape. It is appearing for a limited time for Valentine's Day, but it seems that you can bring it with you or insert it in any scene.
In addition, a boxed "Heart Chocokuro Assortment (5 pieces)" is also available.