Name: Narcissu 10th Anniversary Anthology Project - Season Pass DLC (Steam)
SKU: KT-EF8D5FFFCB
Price: 4.74 EUR
Availability: InStock

The season pass includes the following DLC: Narcissu: A Little Iris - A side story set in medieval Europe, exploring what it means to desire to live, or die. Narcissu: Zero - The origin story of the 7th floor hospice and its rules. Narcissu: Sumire - An entirely new chapter in the series, it tells the tale of two girls who cross paths: one dying and the other desiring death, both filled with profound regrets about their respective lives. Narcissu Anthology Soundtrack - the 2-disc Soundtrack for the entire series, in fully lossless FLAC format

Redeem on Steam

You need a Steam account and the Steam app.

Step 1: Open Steam and sign in.
Step 2: Open the Games menu, then choose Activate a Product on Steam…
Step 3: Enter the key and follow the prompts.
Step 4: The game appears in your Library.

Steam's redeem page Full guide for Steam

Activation notes from the publisher

Go to: http://store.steampowered.com/ and download STEAM client Click "Install Steam" (from the upper right corner) Install and start application, login with your Account name and Password (create one if you don't have). Please follow these instructions to activate a new retail purchase on Steam: Launch Steam and log into your Steam account. Click the Games Menu. Choose Activate a Product on Steam... Follow the onscreen instructions to complete the process. After successful code verification go to the "MY GAMES" tab and start downloading.