The Butterfly Effect

Its been 40 years since the contract with the owl ambassadors was finalized. Where humans decided that they were not on the right path to find happiness. Until some owls came forward and said "We have been here since the beginning of time with you, your struggle was long and hard. Let us feathered and fanged guide you for only a while." We hurried to set in motion the preparations to live with newfound companions. And now animals serve as lifelong teachers and companions to people, their knowledge combined with humanity's vast development should make the world a safer place, right?
Euro-san has just broke off from home and lives in college and now is unsure whether he was given the skills to learn how to live independently. So he fills out a form to see if any animals will be willing to guide him. But as he meets with the animals wishing to help him, one goes missing. And more and more animals and humans disappear. Well there can only be one culprit..