As people already said, Drug Treatment has LIKE @ ANGEL which is one of the best Kuroyume songs everrr... but if it were up to me personally, I'd choose CORKSCREW. Lots of catchy (albeit simplistic) punky numbers, it's a breeze to listen to. It also carries lots of sentimental value for me, because it was the very first Kiyoharu-related album I ever listened to... and oh boy, did I listen to it religiously a dozen times! xD Good stuff, tho now that I'm familiar with Kuroyume's discography, I'd hardly rank it among their best. But still, it's better for me than Drug Treatment.