This is Attorney Online (abbreviated AO), an online roleplay chatroom game based on the Ace Attorney universe.
You can chat, play cases, or do whatever you want, as Ace Attorney characters.
Originally made by FanatSors in 2013, this game has been a tight-knit community for over a decade.
This is an unofficial port/recreation of the PC client to the Nintendo DS. (It works on DSi and 3DS as well)
Some highlight features:
- Supports playing MP3 files...
Source: https://gbatemp.net/threads/release-att ... ds.644927/