(This is Part 2 of my 2015 anime review series. See Part 1 for more awards on genres & production as well as for certain background information and disclaimers with regards to this series of posts.)
If there is anything that can be argued to exist in all entertainment, that would be the concept of strength. Viewers and creators alike are so enamoured with this notion of power that it is given all sorts of twists. A cornerstone of the action genre is multiple battles of strength between protagonists and antagonists, and these occupy the climaxes of the story. Strength here is usually portrayed as a pure manifestation of physical strength of good triumphs over evil.