| volume | discs | episodes | region 1 | region 2 | region 4 |
| 1 | 1 | 4 | january 31 , 2006 | february 19 , 2007 | march 15 , 2007 |
| 2 | 1 | 4 | march 28 , 2006 | june 4 , 2007 | july 5 , 2007 |
| 3 | 1 | 4 | may 30 , 2006 | september 3 , 2007 | march 13 , 2008 |
| 4 | 1 | 4 | july 18 , 2006 | february 18 , 2008 | june 19 , 2008 |
| 5 | 1 | 4 | september 19 , 2006 | may 26 , 2008 | march 5 , 2009 |