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Me? Well I got interested in Touhou because of LuizPrower (YouTube) playing 7.5. He was going against Suika, the True Last Boss. So my first is 7.5.

That game is a Danmaku fighting game. That and 10.5 & 12.3...although some people say 12.3 is really an expansion of 10.5.

Other than those three games, the rest are Danmaku Shooters...bullet hell and stuff. I haven't played any of the Danmaku Shooters and reason why is because if I have trouble playing Raiden Fighters Aces, Gradius V, R-Type Final, etc, I should expect to not even get pass Stage 1 of any of the Danmaku Touhou games.
(All Touhou games are hard even on Normal.)

Um...not sure if I can recommend any of the games...but if you like fighting games, start with 7.5. 10.5 and 12.3 are based on using cards...adds something to the mix.

I was told that if I did start playing the Danmaku games play Touhou 6 - The Embodiment of Scarlet Devil.

Games below six are played on Japanese PC-98. Supposedly they are identical to American IBM Computers. To play those games...you'll need an Emulator.

By the way, I have all games except Touhou 12. If you can't find them, let me know and I'll upload them on my MediaFire account.

I hope that helps.