Mr. Mendel

Mr. Mendel (メンデル氏, Menderu-shi) is a character who only appears in the special chapter, We Were Born. Mr. Mendel is the father of Margo. He loves his daughter very much and will do anything to save her, including killing another child named Rita.

Plot
Mr. Mendel shows the picture of his daughter named Margo to Rita and he told her that she is the new sister of Margo. He told that, she was born with a condition and Rita said she will do anything to help. Mr. Mendel told to the father that Rita is a good girl and and he told the way for Margo to be healed.

Mr. Mendel went to his home and he asked forgiveness to Margo and she said "There is a meaning to live and each of us gets to decide" and she told to him she wants to write a story. A story about how each of the lives of the people have meaning.

Margo
Mr. Mendel loves Margo very much and wants her to be healed.