In Highschool DxD new Episode 10, Akeno showed her wings to Issei and told that she have both Devil and Fallen Angel wings. But when I was watching Highschool DxD Born then in Episode 1 during one fight it showed that she has both Devil wings.
So is it possible that it is some kind of mistake or there is any explanation behind this event ? I am not sure but there are few other events too which shows that she has both devil wings in previous episodes too. But how it is possible ?