Seasonwise, 1 is best for me, 2 is good as well but in the lightnovel you don't get the same action anyway. Season 3 was very good, but it could have been so much better. For viewers who not sure about Highschool DXD I recommend you finish season 1. It's a must, the last ...
best anime ive ever wacthed I have watched tons of anime's and hand on heart highschool dxd is the best ive ever seen as it has a great story the girls are hot (lol) and there super cool fight seens every ep is good/ i would recomend this above all animes has long as u not ...