Japan is a unitary constitutional monarchy with a parliamentary form of government. In the Economist Democracy Index 2024, it received an overall score of 8.48/10 ("full democracy") and a rating of 9.58/10 for electoral processes and pluralism.
On the national level, the two chambers of parliament (National Diet) are elected directly.
This is the description of the electoral system of Japan as of 29.07.2026 on Electoral Knowledgebase. Sources and further information on this topic: