Downloadable Content

Mature Content Description

The developers describe the content like this:

All characters depicted are over the age of 20.

Content Warning! This DLC depicts: Self-harm, Mental Health Issues, Explicit nudity and R18 adult-themed illustrations.

About This Content

This artbook contains R18 adult-only content, including full adult illustrations and related design materials.

Spoiler warning: This artbook contains endings and important story content. It is recommended to complete the game before viewing it.

After downloading, the Artbook can be found at: %SteamLibrary%\steamapps\common\CatIslandPetrichor\CatIslandPetrichor Please locate it manually in your local folders.

【About Cat Island Petrichor Digital Artbook】

Welcome to the behind-the-scenes world of Cat Island Petrichor. This digital artbook invites you to dive deep into the creative heart of Cat Island, featuring a comprehensive collection of precious visual records—from initial concepts to final masterworks.

【Content Highlights】

• The Souls of the Characters: Includes stunning character portraits of the heroines, design concepts, and detailed character background profiles.

• Secrets Behind the Creation: Explore early development rough sketches, intricate line art, and rare discarded CGs that were left out of the final game due to narrative adjustments.

• Environmental Aesthetics: A look back at the design sheets for the 5 major areas, including the Rest Area, Shrine, and Ruins. Discover how the atmosphere of Cat Island was meticulously crafted to shift with time and weather.

【Specifications】

• Over 150 Pages of Content: A massive volume showcasing the blood, sweat, and tears of the development team.

This artbook is a microcosm of the time we spent together on Cat Island.

Whether you wish to follow the footsteps of Makoto’s investigation more closely, or simply want to cherish the warm yet melancholic visual memories, this collection is an essential addition to your library.