If a card instructs you to "gain" a card from a location, this does not count as your gain step in the Lead action; it is a separate effect that allows you to gain additional cards that turn.

This is supported by the following rule:

• From page 3:

  "Do not gain a location’s bonus if you gain a card through other means (e.g., if a character card says, 'Gain the top card from Luna')."

This indicates that gaining a card via a card ability is distinct from the gain step of the Lead action, which is the only time you also gain the location’s bonus. Therefore, you may gain additional cards in a turn if a card ability allows it, and you still perform the normal gain step of the Lead action.

Source: page 3.

Source: Core Rulebook (pp. 1, 3, 5, 6)