Ah, so I see. The cause of mass immigration. War. When Russia started the war in Ukraine, an American filmmaker Michael Moore said, "America has fought too many wars, we can no longer afford wars." War is the most lucrative business. That's why we can't stop it. The outflow of refugees cannot be stopped either.
Japan has the Japanese Constitution Article 9, which, while not perfect, has at least prevented its citizens from dying in war.
Aspiring sincerely to an international peace based on justice and order, the Japanese people forever renounce war as a sovereign right of the nation and the threat or use of force as means of settling international disputes.
In order to accomplish the aim of the preceding paragraph, land, sea, and air forces, as well as other war potential, will never be maintained.The right of belligerency of the state will not be recognized.
So, to answer your question. I have always voted for parties that welcome immigrants and care about climate change and will continue to do so unhesitatingly.
What I fear is World War III.