Ayumi Arima  

, 有馬 亜由美

Takuya's stepmother works for Geo Technics, which is carrying out excavation work on Sword Cape. Following the loss of her husband, she immerses herself in her job as a way to cope with her grief. Despite this, there remains a lingering sense of sadness in her demeanor. Additionally, Takuya's stepmother is an excellent cook but struggles with vision without glasses. On the other hand, Ayumi faces pressure from the media due to a series of accidents that have occurred at the work site.