No. Entering through Bulgaria does not automatically make Bulgaria responsible for the application. For one destination, apply to that country; for several destinations, identify the main one by the length or purpose of the visit. An overnight stop in Bulgaria followed by a longer Greek holiday would normally point to Greece. First external entry becomes decisive only when no main destination can be established. Prepare a country-by-country schedule showing dates and purposes, and select the competent authority from the real itinerary rather than convenience or expected appointment access.