Puro once read a very long-winded book on psychology to understand human relationships better. His notes for a time became nonsensical to Colin, in fact it messed him up so bad, he vowed to never read it again. Puro's a bookworm, so it must've been an horrendous publication. Puro also peeks over the human constantly when they're separated, and even warns him to watch out every so often, afraid of any harm that may happen upon him. Puro will say that he intended to save the human.