The series wraps up in volume 5, after much bloodshed, much anguish, and some really bizarre death scenes. I haven't mentioned Segawa-sama's lovely artwork, which makes his women look soft and lush even while they're dishing out the pain. Needless to say, this war of attrition between superpowered ninjas comes to a very Japanese ending (or Shakespearian tragedy, if you prefer) and in the end, despite some serious contenders, I have to give the award for Most Bizarre "Ninja Technique" to the superpowered nose hairs. Yes, you read that right.
Links to reviews of v. 1, v. 2 & 3
Basilisk vol. 4 and vol. 5 are both available from Right Stuf, Intl., an online retailer specializing in anime and manga.