I read Tezuka's Unico, which I have read in the past multiple times. Unico follows a young unicorn who is cursed to be alone, and whenever he makes friends, he finds himself quickly whisked away by the West Wind and his memories erased. I think these stories can resonate especially with children suffering depression and loneliness. They see Unico do all he can do be kind and loving, but can never stay for long with those who love him. On the other hand, when given love, Unico can transform into a full grown unicorn with wings, and gains strong magical abilities. This sends the message that through love and teamwork, children can be strong and protect their loved ones.