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Undying Flower Steam Key: Official PC Key, Instant Delivery

Yes. Every Undying Flower key we sell comes from a distributor authorized by the publisher.
Open Steam, click Games, choose "Activate a Product on Steam", then paste your key. Undying Flower is added to your Steam library right away.
Some keys only work in certain regions. This page shows where this Undying Flower key can be activated before you buy.