The version of DDP included with Instant Brain is a clean, bare-bone conversion. It's better than both the PS1 and the Saturn version, but you don't get any extras and you don't get to tate your screen. If you're fine with that, DDP remains a blast of a game from a very different era of shoot'em up gaming (at least when compared to Saidaioujou).
Instant Brain can be picked up for a mesely 1,500yen 2nd hand in Japan and with DDP unlocked that's absolutely worth it.
On GameFAQs you can find a walkthrough to Instant Brain, but clicking through a japanese visual novel for hours and hours is nothing I can be bothered with. Unlocking DDP without that isn't this hard, it's nothing illegal and does not require a modded XBox. Maybe there are other manuals for this online already, but I couldn't find any and it's not this easy to wrap your head around it, if you've never done it before.
What you need:
1) a 360 which can run Instant Brain (likely region locked, so japanese or RGH/JTAG)
2) a copy of Instant Brain (LE or regular)
3) a USB stick (1GB or more, not the slowest you can find)
4) this: http://pms.hazard-city.de/DDP.zip
5) 10 minutes of spare time
How to do it:
1) format the USB stick on your XBox360, so it can be used to store XBox files
2) start Instant Brain with your regular profile signed in
3) when the game asks you which storage device to use, choose your USB stick
4) start the game, (hold LT to fast forward), hit the Start button to pause and save your game
5) exit the game, switch off the console, take the USB stick to the PC.
6) unpack the zip file, you'll find a savegame for Instant Brain, USBXTAF and the XBox Save Editor
7) start USB XTAF, Click on FILE > OPEN DEVICE SELECTOR, choose your USB Stick and click OPEN DRIVE
8) In the left window, nagivate into the Data Partition, Content Folder. You'll find two folders. Open the one with numbers and letters (that's your profile code), open the folder 435A07E0 (that's the game code) and the folder 00000001 inside.
9) Inside you'll find your save game (GAME DATA 1 and SYSTEM DATA). Extract one of the files (right button, extract)
10) open the XBox Save Editor, open the file you just extracted. Click on SAVE ID Defaults (in the middle of the window).
11) Now open the first of the save games you extracted from the zip (GAME DATA 1). Click LOAD ID DEFAULTS, check the box LOCAL SIGN (bottom right) and hit RESIGN SAVE. Choose the included KV.bin, when the program asks for a keyvault. (Now you signed the first game save file with your own user code and device id, which makes it usable on your own 360.
12) repeat for the other files (GAME DATA 2-7 and SYSTEM DATA)
13) In USB XTAF delete all the existing files in the 00000001 folder. Right click into the right window, choose INJECT and put the newly signed files into this folder.
14) Close everything and take the USB stick back to your console.
15) Start up the game, when asked for a storage device, choose your stick.
16) Choose SPECIAL in the main menu and here you'll find DDP for Kinect, DDP and Nin2-Brain.
You can copy or move the save games from the USB stick to your hard drive using the storage management in the system settings of your XBox360.
Enjoy a brilliant conversion of a real shoot'em up gem !!
Because who wants this
when one can get this ?
