They say "friend" so often in this season that I already forefeel my utter disappointment. Then I'll just remember it by my alternative title forever: "Family (but Mostly Father) Issues: The Series With Transformations, Singing, and Yuri-Baiting"
There isn't, but sword classes get Axebreaker, which gives bonuses against axe wielders.
Of course, even in games with the weapon triangle, I've found that if a unit's significantly more powerful than its opponent, it being at a disadvantage when it comes to the weapon triangle isn't as important.