© 2026
On the night of the full moon, a young man becomes assistant to his childhood friend, a detective. They take on guild quests, solve mysteries, and chase the phantom thief “Obrutale,” a figure both feared and admired. A mystery RPG full of story, battles, and secrets.
🌙 A Detective Watches the Moon
~ On the night of the full moon, the detectives confront the phantom thief ~
One day, Alf, a boy who helps out at his family's restaurant, is visited by his childhood friend Charlotte, a young detective.
Alf "Oh, Charlotte—when did you get here? Have you decided what to order?"
Charlotte "Hehehe... I was waiting for you to finish! My order is... a brilliant assistant!"
The mysterious Phantom Thief Oblutaire continues to elude capture while stirring rumors throughout the land.
To follow the trail left behind by the phantom thief, the two set out on a moonlit adventure.
🌍 Message to Players Outside Japan
Thank you very much for adding this game to your wishlist, even when it was previously available only in Japanese.
This game is primarily developed in Japanese, with the English version provided as a supplementary translation.
As the creator does not speak English, the English translation was created with the assistance of ChatGPT.
Character names, world-specific terminology, and recurring expressions were carefully managed to ensure consistency throughout the game. While every effort has been made to provide a natural translation, you may still encounter minor imperfections.
The game will automatically launch in Japanese or English according to your Steam language settings. No manual language selection is required.
⚠️ Cultural & Content Notice
This game was created from a Japanese cultural perspective.
As a result, certain values, customs, beliefs, or expressions may differ from those familiar to players in other countries. We appreciate your understanding and hope you enjoy experiencing the story from this perspective.
🔍 About the Game
A Detective Watches the Moon is a detective RPG where you gather clues, solve mysteries, and use deduction to uncover the truth behind each case.
As the story unfolds, you'll complete side quests, battle enemies, solve hidden puzzles, overcome mysterious challenges, and piece together clues that lead you closer to the truth.
For players seeking an even greater challenge, you can choose not to use the helpful item "Alf's Notebook."
Will you follow the guidance of Alf's Notebook and enjoy the adventure as an RPG, or discover hidden clues and secrets on your own to uncover shortcuts to solving each case as a true detective RPG?
Think you have what it takes?
🎮 Game Features
■ Gather clues throughout the main story to uncover the mysteries behind each case.
■ Solve hidden ciphers and puzzles to reveal secret bosses and grow stronger by defeating them.
■ Discover new secrets by examining familiar locations from different positions.
■ Help townspeople through side quests to obtain powerful items.
■ Feed Charlotte different dishes to inspire unique battle skills.
■ Enjoy strategic turn-based battles where elemental affinities and equipment choices determine victory.
■ Join the guild, complete requests, cook meals, challenge powerful bosses, and aim for the highest Detective Rank!
📝 Developer’s Note
This game is a solo indie project that began as a personal hobby.
After nearly five years of development, the first entry in the A Detective Watches the Moon series has finally been completed.
While the main case featured in this game reaches its conclusion, the story of this world continues in A Detective Watches the Moon II and III.
A Detective Watches the Moon II is currently in development.
I hope you enjoy this adventure, and I would be delighted if you look forward to the completion of the sequel.
🧩 Difficulty
Please note: Some puzzles in this game are intentionally challenging.
If you become stuck, you may find helpful hints in the "Detectives' Gathering" section of the Community Hub.
Besides the in-game hints, searching online or using translation tools may also help you discover the next clue.
Some NPC dialogue can only be heard once and may contain important information, so we recommend keeping notes as you play.
🎮 Controls
Supports both keyboard and gamepad controls.
Development and testing were performed using an Xbox-compatible controller.
If the game launches in the wrong language, right-click the game in your Steam Library, select Properties → Language, and choose your preferred language.
📺 Streaming & Let’s Plays
Streaming and gameplay videos are welcome.
Please note that there are a few guidelines listed in the Community Hub.
If you plan to stream or record the game, I would appreciate it if you could review them beforehand.
Japanese, English
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