Of all things Yu could have imagined reincarnating as, a mutant willow tree was definitely not one of them. Yet, by some stroke of fate, Yu had actually become a tree stuck in a canyon between two mountains. To make matters worse, his new environment was sprawling with humans and strange mutant creatures that were out to get him. Luckily, the one silver lining in this bizarre situation was his gift of evolution which gave him the necessary mutations he needed to survive. However, these encounters with monsters soon provided him new perspective as to who the true monsters in the world might be.