It's TOO cute! I want one too. But how do you fire it?
At very close range.
It looks like the trigger/trigger guard assembly pivots as one unit, as the hand (which advances the cylinder) is attached at the rear of the trigger guard. At the same time the mainspring is compressed bringing the hammer back. Given the pivoting guard assembly, I'd say the actual trigger is the serrated part below and in front of the guard.