Dai Gyakuten Saiban: Naruhodō Ryūnosuke no Bōken — known in the West as The Great Ace Attorney — is a visual novel courtroom adventure developed and published by Capcom. Originally released in Japan for the Nintendo 3DS, this English-patched, decrypted ROM lets you experience the full story on PC through the Citra 3DS emulator. The package includes the base game (609MB) and an English patch plus update v2.3.0.2 (10MB), giving you a complete, playable version of Ryūnosuke's origin story.

If you enjoy narrative-driven mystery games with investigation phases, cross-examinations, and dramatic courtroom revelations, this title delivers a substantial campaign. You'll follow a Japanese law student in Meiji-era Japan and Victorian London as he builds his legal career alongside a cast of memorable characters. The English patch makes the story accessible to players who don't read Japanese, and the decrypted format means you can load it directly into Citra without additional conversion tools.

Technical Specifications

Key Features

• Full English patch included — Play the complete Japanese release with translated dialogue, menus, and story text.
• Decrypted ROM format — Loads directly into Citra 3DS emulator without needing decryption tools or a physical 3DS.
• Courtroom drama gameplay — Investigate crime scenes, gather evidence, and cross-examine witnesses in multi-part trials.
• Dual setting — The narrative moves between Meiji-era Japan and Victorian London, with distinct characters and cases in each location.
• Update v2.3.0.2 bundled — The patch package includes the latest English patch and update files (10MB) for improved compatibility.
• Windows-compatible via Citra — Runs on PC using the Citra emulator; no Nintendo 3DS hardware required.

Pros & Cons

• Pros:
  • English patch makes a Japan-only title playable for Western audiences.
  • Decrypted ROM simplifies setup — no need to dump your own copy.
  • Includes the v2.3.0.2 update, so you're not hunting for separate patch files.
  • Rich story and characters from the Ace Attorney series creators.
  • Moderate file size (609MB) for a full 3DS adventure game.
• Cons:
  • Requires the Citra emulator and shared fonts — extra setup steps.
  • English patch is community-made; some text or timing may differ from an official localization.
  • No native Windows installer — you must configure Citra manually.
  • Region settings in Citra must match the ROM to avoid issues.

About the Game

Dai Gyakuten Saiban: Naruhodō Ryūnosuke no Bōken is the first entry in the Great Ace Attorney duology. You play as Ryūnosuke Naruhodō, a law student who travels from Japan to England to study law and ends up defending clients in court. The game blends visual novel storytelling with interactive investigation and trial sequences. You'll examine scenes for clues, present evidence, and press witnesses during cross-examinations. The English patch covers the main story, menus, and most in-game text, making it a solid choice for fans of the Ace Attorney series who want to experience this prequel.

The game was released in Japan on July 9, 2015, and this English-patched version was prepared for Citra emulator users. The patch source is linked from the GBAtemp community thread, and the update v2.3.0.2 is included in the download package. If you're looking for the sequel, you can also check out the Dai Gyakuten Saiban 2: Naruhodo Ryunosuke no Kakugo Demo (English Patched) 3DS [Decrypted] ROM for more courtroom action.

Installation Guidance

To play this ROM, you'll need the Citra 3DS emulator installed on your Windows PC. The input notes recommend using the latest Citra Canary build for best compatibility with the update/patch. Here's what the process involves:

• Download the base game ROM (609MB) and the English patch/update file (10MB).
• Extract the RAR files using WinRAR or 7-Zip. No password is required on any files.
• Open Citra and load the decrypted ROM via File > Load.
• Install the update CIA from Citra's File > Install CIA menu, then restart the emulator.
• If Citra asks for shared fonts or 3DS dump files, get them from the Citra setup guide on Ziperto.
• Set the Citra region to match the ROM (Japan) in the Emulation/Config menu.

For more details on emulator setup, refer to the Citra 3DS Emulator page linked in the original post. If you encounter broken or missing links, you can request a reupload through the site's reuploads page.

Version Freshness & Trust Signals

This package includes the English patch and update v2.3.0.2, which was the latest at the time of the original posting. A newer English patch (v2.4.0) is available separately — the input notes point to a dedicated page for that version. Always check for the most recent patch if you want the latest translation fixes. The developer listed is Berry, and the game is published by Capcom. The ROM is provided as-is for use with Citra; no malware scanning claims are made here. File sizes are accurate: 609MB for the base game and 10MB for the patch/update.

Remember that decrypted ROMs are intended for personal use with emulators. If you enjoy the game, consider supporting the official release where available.

Download Links

Base Game (JPN) — 609MB

TusFiles | MegaUp | UptoBox | 1Fichier

English Patch & Update v2.3.0.2 — 10MB

MegaUp | ZippyShare | SolidFiles | 1Fichier

For the latest English patch 2.4.0, visit the dedicated page linked in the original article.

You May Also Like

If you're interested in more Ace Attorney content, check out the Dai Gyakuten Saiban 2: Naruhodo Ryunosuke no Kakugo Demo 3DS (English Patched) CIA for the sequel demo. Also, if you're curious about other Nintendo platforms, our Ziperto Wii U guide explains what that keyword means and where to find Wii U content.

If you like this game, buy it and support the developers.

Frequently Asked Questions & Setup Guide