 If you liked
Black Lagoon
|
 ...then you might like
Grisaia no Kajitsu
|
both anime is about gun war.
-Revy reminds me of asako of grisaia. they're look alike and shares the same characteristic and personality.
If you love guns, killings, and good story. You should give any of this a try.
If you happen to watched any of these two, try the other one. Bot shows shares the same atmosphere and enjoyment. enjoy!