On another expedition in the other world's monster forest, Yuya encounters and rescues a Black Fenrir puppy, whom he takes in as a pet and names "Night". As he takes Night for walks in his neighborhood on Earth, Yuya inadvertently draws even more positive attention to himself, and by chance he also meets Kaori and Miu. After Night proves more capable than his appearance suggests, he accompanies Yuya on his monster-hunting exploits, during one of which they slay a Crystal Deer which wields both fire and water magic. A drop item it leaves behind after getting killed bestows Yuya with an instant hot bath whenever he needs it. On another trip, they discover a cave, which contains a man's skeletal remains and a tome labelled The Book of the Sage. In the meantime, an infamous assassin named Headhunter is hired to kill Princess Lexia.