Radilgy or Radirgy, shortened from Radio Allergy, the proposed North American release (Rajiruji in Japanese ラジルジ) is a vertical shooter released late into the Dreamcast's official life; February 16 2006.
In addition to the game, which could only be bought through SEGA Direct in Japan in 2006 (how I ordered mine) is a phone card for use in Japan. This was quite frequent with releases in Japan through SEGA Direct, but seems more fitting in this game as you essentially play a girl (or boy) that has to rescue her father from terrorists so she (or he) can get the medicine for their radio allergy. Mental I know, but this is Japan!
So, how does it fair with the other Dreamcast shooters? (what shooters I hear you ask??). Well, it's pretty solid, but it's no Ikaruga - but what is. The styling of the game is pretty unique; cell shaded graphics (think Jet Set Radio) over VGA really make the Dreamcast seem like it was released in 2006. If you're a collector, or just into shooters; I would heavily recommend this game. There's a really fun soundtrack to the game as well - which is a refreshing change as many shooters decide to go down the 'dark and dismal' route.
There's a variety of button commands, including shoot, bomb and a like of sword attack. This adds hugely to the strategy of the game. The casing of the game shows off some of the attention to detail given within the game. It's hard to think a title of this quality was released so late in the [official] life of our beloved Dreamcast.
So sure that this would be a great title; I bought two. Yes, that's right, I have a sealed copy up for sale on eBay and you can bid on it here. I'll leave you with a little gameplay video. Enjoy!