Find this ऐनीमे

This ऐनीमे is about a young boy, he lived with his father and is supposedly an alien at the end of the show. He travels around with his companions, me remembering only one. It was a man (teen), he had a sword that had an eye on it, it could turn him into a giant demon, this would give him strength. The main character (alien-boy) had a hat covering his alien ears या what sorts, he was able to create portals with his hands. In the end of the show, he had to stop a time traveling maniac who wanted to see his family, but in order to, he had to suck out the life essence of living things. Please help me find this, its been driving me nuts for a year.
 KnownFor posted एक साल  से अधिक पुराना
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