This is the newer Touhou fangame that erisu was working on which was developed with libnds. The nds file is over 30MB so i haven't bothered to host this one, instead i uploaded it to mediafire incase you have trouble downloading it from erisu's wiki.
"Demo of current and probably soon to be abandoned newer touhou, seriously a work in progress..
Please place these files in the root directory of cards in order to work, except the .gba and .sc versions i believe can be placed anywheres. They are both FULL of bugs and problems. Feel free to mod the sources as you wish."