I Became My Dao Companion's Treasure-Seeking Mouse

A top-tier Earth-rank cultivator from the cultivation world transmigrates to Earth, which is in the middle of an apocalypse. For some inexplicable reason, he picks up a man, and from then on becomes that man's personal treasure-hunting rat accessory... [What if all the treasures I find are things I can't use or don't need?] No problem. That guy needs them! [So everything I find is meant to be given to someone else?] [Am I just a treasure-hunting rat?] The disgruntled Xiao Ziyue, a treasure-hunting rat, bosses the man around. "I want spicy chicken. Hurry up and make it!" Xiao Ziyue is an unaffiliated Earth-rank cultivator from the cultivation world. By a twist of fate, he comes to Earth, which is fighting for its very survival. After hearing from someone that Earth has countless delicious foods and fun mobile games, he generously opens his purse to help its struggling people... [Earth has no spiritual energy?] [No problem. It has five-element mystic power. I'll teach you how to cultivate!] [Storage space, a must-have for home and travel!] [No weapons?] [How about a baby sword spirit who takes the initiative to cling to you?] [The animals disappeared after the apocalypse?] [No problem. I'll take you all to cuddle giant pandas!] [The internet's down, so we can only play offline games?] [No problem! We can go play monster-hunting games in the primeval rainforest, and treasures drop too!] [No plants means no delicious food?] [That won't do. Without ingredients, how am I supposed to shamelessly get Yan Jingchen to cook delicious food for me?] Theme: A treasure-hunting rat should act like one