So, how many episodes are there?? And is there only one season??

There are only 26 episodes, the last 4 are OVA (Original Video Animation) that are extensions to the series.

Yes, there is only one season and no amount of petition will bring about a segundo because of the ending, the work that went it to it, and the fact that the original may-akda would like to be done with it.

There are 26 Episodes and 4 OVA Episodes.
The listahan of Episodes are:
1.City Of Howls
2.Toboe, Who Doesn't Howl
3.Bad Fellow
4.Scars in the Wasteland
5.Fallen Wolves
6.The Successors
7.The bulaklak Maiden
8.Song of Sleep
9.Misgivings
10.Moon's Doom
11.Vanishing Point
12.Don't Make Me Blue
13.Men's Lament
14.The Fallen Keep
15.Grey lobo - OVA
16.Dream Journey - OVA
17.Scent of a Flower, Blood of a lobo - OVA
18.Men, Wolves, and the Book of the Moon - OVA
19.A Dream of an Oasis
20.Consciously
21.Battle's Red Glare
22.Pieces of a Shooting Star
23.Heartbeat of the Black City
24.Scent of a Trap
25.False Memories
26.Moonlight Crucible
27.Where the Soul Goes
28.Gunshot of Remorse
29.High Tide, High Time
30.Wolf's Rain
Hope it helped^.^ If not, then I am sorry for bother you.

There is 30 episodes and yes there is only one season, but people are saying that there is probably going to be a season 2.

well i think for now there is only 1 season but i heard that there might be a season 2