Do not watch if you have heart disease ☻, might lead to heart attack you know, no enemies here, no fraction only real, good back story from every team, weaker or stronger have own struggles, you can find fun, intelligent, sprite, reckless, confidence, shy, almost every type of people,
I watched a lot of anime, and I was on impression that we need fractions world like Naruto or one piece for thrilled but this give a lot