5

This is explained in the bonus chapter 「その後の園子」 (Sono Ato no Sonoko, Sonoko After), published on Dengeki G's magazine ed. 2015/03. The story talks about the everyday life of Nogi Sonoko and the heroes after the final battle. It also explains the reason why the divine tree decided to "reverse the effect". Excerpt from the script (possible spoiler for 2nd ...


4

In Gin's era, the Hero System wasn't fully developed yet. The girls didn't have fairies to protect them, so they could and often did get hurt. They also didn't have the sealing ritual or Mankai at first either, so in the early battles they had no way to kill a vertex; the best possible outcome was to drive it off without any of them sustaining any serious ...


3

Originally, it was called 大社 (Grand Shrine), but later it's revised to 大赦 (Amnesty). In Nogi Wakaba wa Yuusha de Aru (Nogi Wakaba is a Hero), the prequel to Washio Sumi wa Yuusha de Aru (Washio Sumi is a Hero) and Yuuki Yuuna wa Yuusha de Aru (Yuki Yuna is a Hero), the organization was originally named 大社 (Grand Shrine). From ch. 3, pg. 5, The counter-...


3

The light novel Washio Sumi wa Yūsha de Aru, which is set in the same universe 2 years prior and is the prequel of the anime, targets the seinen demographic. The seinen demographic includes males from 17 years of age and above. It can be safe to assume that the anime Yūki Yūna wa Yūsha de Aru is for the same demographic as the light novel. The show is also ...


1

When they bloom, the girls' bodily functions aren't lost, per se, but are "given" to the divine tree as an offering. At the end of the series, the divine tree elects to return what it took (i don't remember if the reasoning was expressly stated or not, but I like to think that it realized the extreme detrimental effect this was having on the girls).


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