So Nier has Ending E which is a shmup credits section. It's deliberately designed to be incredibly difficult, and the game itself repeatedly asks you if you want to give up as messages from other players encouraging you start to appear on the game over screen. After a certain number of deaths, you get the option to accept help from other people, and once you accept it, your lone player ship is joined by the ships of other players who stack their firepower on top of yours and start shielding you with their own bodies whenever you take a hit, with each hit resulting in the message that a random player's save file was deleted. This is considered peak "ludonarrative" storytelling and it's meant to teach you the story's overall theme that one cannot live on their own and that you have to accept others into your life to make it bearable and give it some meaning. After the final happy ending, you are then asked by the game if you want to leave a message for the other players who are struggling to beat Nier: Automata and this is the source of the messages that encouraged you when you were stuck in the shmup section. After leaving the message, you are then asked if you want to further help them by sacrificing your save data. If you agree to this, your save file will be deleted, and your player name will be entered into a database from which the player names that help you in the final sequence draws from.
However, when Kiara played through Ending E, all of this went completely over her head and she just bitched about how hard the shmup section was. When asked to leave a message for the other players, she left a negative message about how "It was too hard and you should just give up." Turns out the game actually checks how negative your message is, and if it's considered too negative you won't even get the option to delete your save data, which is something that not many people even realized existed. Keks were had.