Yes sadly it is only 42 eps...
But thats where the manga comes in to save the day

In the series they do set it up for a second season but that never happend...as far as i know they company that was making it lost funding so they had to stop...
I think the second half of the manga would have made great episodes...
But there were some pretty dissapointing differences that wernt in the series that should have been...one Ganko is not presant at the tournament she stays at Fuko's house the entire time. The biggest one being that in the final round of the tournament you dont get the see the Joker VS. Kaoru fight... of the 6th form of KougaAnki(i think thats the weapons name) also MANGA SPOILERS....
you also dont get to see Kurei fight with the soul of the guy he absorbed(i cant remember his name)after the guy with the demon gun killed him, they also show Kurei's true flame shape(Phoenix) WAY before your supposed to see it...End Spoilers