Techno and Pop music are both rather popular genres in Japan, but in America, it's quite rare to hear techno music nowdays, so I can clearly understand why many are not very familiar with techno.
Well, as for me. I've been listening to J-pop, techno, salsa, and K-pop for as long as I can remember, I basically grew up listening to music that's not American, so I'm very familiar with this kind of music, and I dig the techno songs. Especially Japanese. I would have to say that around 10 was the age where I actually started to listen to J-pop more.
It's great to see that you're giving a new genre of music a try! That's always a good thing!
And yes, it's her 15th anniversary. Hope to see lots more of Mai in the future.