Black cat starts off very strong, we are presented with what seem like interesting characters. Then the plot happens and the characters take this turn, and just just become so boring. The plot itself is pretty standard revenge stuff, it doesn't really bring anything new to the table. We don't even get to see any character development, it all happens between the small time jump.
It's not terrible looking, some of the character designs are a bit "eh" I still suggest giving it a try, I might not have liked it, but I know others who have. But I highly suggest reading the manga. I haven't due to the bad taste this left in my mouth, but usually the manga is better put together and well... Detailed.
