How do you get MOCHI in Mineral Town?

Excuse me, I'm curious about something. I've been playing this game called Mineral Town, and I've heard about this item called MOCHI. It sounds like an important item to have, but I'm not quite sure how to get my hands on it. Could you please enlighten me on the process of acquiring MOCHI in Mineral Town? Is it through a specific quest, by talking to a certain NPC, or perhaps by fulfilling certain conditions? I'd greatly appreciate any insight you can provide.