I enjoyed watching this anime. The main characters are well developed, the animation is great, the story is simple but nice to follow and the philosophy and hardship the characters go through are engaging.
Unfortunately there were several episodes around the middle of the anime that took me out of it because it was not believable. I don't know if it's because of japanese culture or if they didn't know or want to add this into the anime but all the practical stuff and security about the expedition is greatly missing. The main characters are 4 girls of 16 and 17 years old and even though they really are invested in the expedition nobody warns or informs them about its difficulties. Their parents don't help them and the only moments where they may have received information are with the document about the expedition and the 2-days stage but as a viewer we never know what's in it. And as they discover nearly everything along the story and their difficulties we can only assume they didn't know much.
