Wagyu

Wagyu is a compulsive collector. Ever since he was young, his biggest dream was to travel different realms and collect trinkets and items from across the lands. However, if he were to travel someday, he would have to leave behind his collection back at his family's house on their ranch. Fortunately, his mother gave him a special gift in his teen years. A box that could hold an infinite amount of things, and simultaneously weigh nothing. Having solved his main problem, he soon after bid his family goodbye and set off on his journey to explore as much as he could.

 Years later, he decided to visit a realm that had been long forgotten, its buildings and relics had experienced deterioration from time. In his mind, this situation was more than ideal. He could explore around in an abandoned temple and pocket artifacts from centuries ago. While he was scavenging through the rubble, he came across a wooden chest covered in dust and speckled with wet mold. As he opened it, he discovered a peculiar-looking red mask. And along with that mask came a new adventure and a burden for him to get rid of.