The protagonist is a male high school kid that gets caught up in an apocalypse where magic becomes real and technology no longer works. People discover magical abilities; creatures of myth and legend become real. After he escapes the chaos of his hometown he meets up with a unicorn, I think her name is Ariel, she has a massive sweet tooth. They become best friends and look after each other whilst traveling.
The unicorn gets kidnapped by a magic user and the protagonist goes after her and hooks up with other survivors trying to stop the magic user. He also meets up with a guy that has a bonded bird of prey, and a sword master that teaches him the basics of bushido.