I Transmigrated into the Wrong Body

On his way home from work, Aster died on a snowy night in a freak car accident. When he woke up, he was no longer on Earth. Not only that, he realized he was in a body that already had someone there! The other person was named Ellery and he was just as confused as Aster. Aster also found out that Ellery was a Guide! Sentinel and Guide? What's that? What's a quantum beast? Could he have a quantum beast too? Will the introverted Aster be alright with the extroverted Ellery? Aster really didn't know how this was going to work... ~~~~~~~~~~~~~~~~ The cover is one I commissioned which means I have all rights to it. I will have a link on my profile to the artist's page!