I have watched all the seasons of Cute High Earth Defense Club and personally this is my most favorite season. First, since I'm a hardcore fujoshi(yaoi lover a.ka. Boys' Love Fan), I enjoyed watching it because of the ships and this has more fan service than the previous ones which is a good thing for me of course. Second ,the music. The opening and ending theme is good. I especially liked the "Are you happy?" transformation songbecause it is so catchy. I never skipped it even once. :)

Third, the animation. It is greater than the first 2 seasons. It's
more colorful and the art style is amazing. I like their costumes
now and for me it's less cringy than the 1st one.

Fourth, the characters are still so likable cause they are have
different personalities and of course they are all bishounen so
that's a plus.

Fifth. The story is fine for me since it's a parody anime, I didn't
expect much. I just wished that they changed the plot a little
like maybe they should've added strong rivals?

What I don't like about it is they always end up in the bath. I'm
thinking, don't they have any other thing to do? But besides
that fact, I highly recommend others to watch it because it's
super enjoyable to watch. I honestly didn't get bored watching it one bit. So ENJOY!!!