I need to structure the guide in a way that's helpful for fans. Start with an introduction to Milky Holmes, then delve into cat themes, specific characters, the fan club, possibly some fan creations or events, and address the "extreme" aspect. Also, ensure that the content is appropriate, considering "extreme" might involve fanservice, so a disclaimer about content warnings is necessary.

Use keywords like "Milky Holmes Extreme Gokkun" or "Mari Hoshizawa Cat cosplay" when searching for niche content. Enjoy the "mystery, madness, and meow"! 🐾🕵️‍♀️ Disclaimer: This guide is for informational purposes. Always adhere to your region's laws and personal discretion regarding adult content.

Check if there's official merchandise or events that combine these elements. Also, note that some content might be NSFW, so the guide should mention that. Maybe include tips on where to find such content, like fan sites, official stores, or events.