Players must solve puzzles & make life-altering decisions in a mysterious facility. Secret identities, mind-bending twists, & branching paths lead to multiple endings in this psychological thriller.
The character Phi's name is derived from the golden ratio (φ), which is approximately equal to 1.618 and often symbolized by the Greek letter phi (Φ or φ), tying into the game’s themes of mathematics and mythology.
Voice actor Takumi Asahina, who voices Tenmyouji in the Japanese version, shares the same last name as Luna's Japanese voice actress, Atsuko Tanaka, creating an interesting coincidence, since both characters have a deep connection in the game's plot.