TV-Series
Description
Kodai Arima, deceased husband of Keiko Arima and father of protagonist Takuya Arima, died before the story's main events. His given name combines "広" (ko, "wide/broad") and "大" (dai, "big/great"), while his surname "有馬" (Arima) blends "有" (ari, "exist") and "馬" (ma, "horse"). Initially a cosmological astronomer, Kodai shifted his career to historical research after encountering the anomalous Mount Sankaku and its mineral Psychite. This change reflected his deepening obsession with investigating the site's unnatural properties and temporal anomalies.
Kodai maintained a distant, fractious relationship with his son Takuya, strained by his intense research focus. Following months of unexplained absence, he was declared dead. Prior to vanishing, however, he dispatched a package to Takuya containing an otherworldly "reflector device" enabling interdimensional travel, accompanied by an unfinished letter. This letter revealed Kodai's theory of multiple timelines and parallel worlds, explicitly stating he hadn't died but journeyed to another dimension. It instructed Takuya to find missing power-source jewels for the device and meet at Sword Cape (Triangle Mountain) at a precise time.
Kodai's research meticulously documented parallel world mechanics and the reflector device's operation. His journal, later found in the parallel world of Dela Grante, provided Takuya with critical insights for navigating interdimensional travel challenges and comprehending the larger cosmological conflict. This work established foundational principles on the balance between determinism and free will within the multiverse, proposing that while certain events might be fixed across timelines, individual actions could still influence outcomes.
His academic partnership with Sakaimachi Academy's headmaster, Kouzou Ryuuzouji, ended mysteriously. Unbeknownst to others, the original Kouzou was murdered and replaced by an interdimensional entity impersonating him; this impostor actively sought Kodai's reflector device and research. Kodai's legacy centers on his groundbreaking discoveries concerning Mount Sankaku, Psychite, and multidimensional travel, which inadvertently set the narrative's central conflicts into motion and equipped Takuya to confront them.
Kodai maintained a distant, fractious relationship with his son Takuya, strained by his intense research focus. Following months of unexplained absence, he was declared dead. Prior to vanishing, however, he dispatched a package to Takuya containing an otherworldly "reflector device" enabling interdimensional travel, accompanied by an unfinished letter. This letter revealed Kodai's theory of multiple timelines and parallel worlds, explicitly stating he hadn't died but journeyed to another dimension. It instructed Takuya to find missing power-source jewels for the device and meet at Sword Cape (Triangle Mountain) at a precise time.
Kodai's research meticulously documented parallel world mechanics and the reflector device's operation. His journal, later found in the parallel world of Dela Grante, provided Takuya with critical insights for navigating interdimensional travel challenges and comprehending the larger cosmological conflict. This work established foundational principles on the balance between determinism and free will within the multiverse, proposing that while certain events might be fixed across timelines, individual actions could still influence outcomes.
His academic partnership with Sakaimachi Academy's headmaster, Kouzou Ryuuzouji, ended mysteriously. Unbeknownst to others, the original Kouzou was murdered and replaced by an interdimensional entity impersonating him; this impostor actively sought Kodai's reflector device and research. Kodai's legacy centers on his groundbreaking discoveries concerning Mount Sankaku, Psychite, and multidimensional travel, which inadvertently set the narrative's central conflicts into motion and equipped Takuya to confront them.