This is Mini Cola. You can't drink it, though. The container is about the is meter of a quarter and looks suspiciously like an Atlanta-based soft drink can. And the top even has a pull-tab to open it!
Both have neat containers that can be repurposed to hold beads or tiny pebbles if you're a kid! The chocolate box lid is also a small whistle, to irritate others around you! And they are each under 40 yen, so they're pretty cheap for trick or treating!