She lives in a typical Korean-style high-rise apartment. If there is a picture of the outlet, it will be certain (Korea uses 220V, which is similar to the EU outlet), but considering that Japan has relatively few high-rise buildings compared to Korea due to the risk of earthquakes, it is likely that it is a Korean living in Korea. And the most striking evidence is her computer. Her computer is a product in collaboration with v-tuber in Korea and is not a product sold overseas (Korean standard). Also, it is certain to use the Korean electrical system, even if it is an outlet shape unless the computer power parts are purchased separately.