Masakatsu Yuuki
CV: Yuki Fujiwara
Second-year student at Sakaimachi Academy. Takuya's junior. He incessantly clings to his savior's side ever since the day Takuya rescued him from some troublemakers.
Toyotomi
CV: Takuya Eguchi
An employee of Geo Technics and foreman of the coastal construction work. He reports directly to Ayumi.
Kouzou Ryuuzouji
CV: Taiten Kusunoki
Headmaster of Sakaimachi Academy and old friend of Takuya's father, Koudai Arima. He moved into the abandoned mansion in town after Koudai passed. He spends his days absorbed in continuing his colleague's research.
Houjou
CV: Youji Ueda
Detective. He was hired by an unknown source to investigate the disappearance of Koudai Arima. He constantly hangs around Kanna Hatano, whom Koudai is said to have watched over.
Female Guard
CV: Ayano Yamamoto
The guard overseeing the front entrance of Geo Technics, where Ayumi works.
Koudai Arima
CV: Keiji Fujiwara
Father of the protagonist, Takuya Arima. A historian who researched Triangle Mountain in Sakaimachi. He died just two months ago while conducting field research. He was reported to have been killed by falling rocks.
