Purplehearts
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Watch Leo feel challenged and buy her a real dolphin for her birthday next year.
Hate is a strong word, I think it is quite the opposite. He must have really loved his sister and when she left you could imagine the pain he must have felt. So he thinks that distancing himself from Emilia means that he won't get as much hurt if/when she leaves again.
She said (in her thoughts i guess) that she has always dreamed of wanting to cut her hair as short as possible. She has also subtly indicated that she wanted to cut her hair. I do agree though, I am just saying why he must have done so.