Touka may be selfish, but she'a a good girl, always thinking of those around her. Nemu is stubborn and sarcastic, and wants approval badly, but she's also a good girl who looks out for others. Ui is serious and a little dense sometimes, but she too is a good girl, kind to all. The stories they made know this from peeking out from their book.
Touka is the most selfish, but actually she is a good child considerate about her surrounding. Nemu is a stubborn satirist, but she is actually a good child who cares about others. Ui is serious and a little insensitive, but she is a good girl kind to everyone. The created stories know about these. We are peeking at everyone from the book.