Omoikane, who formulates the plan for the rock cave, is the god who was first commanded to "think" in the darkness. When Amaterasu-Omikami hid in the Heavenly Rock Cave and the world was filled with calamity, the Kojiki recounts that the myriads of gods gathered at Ame-no-Yasukawara and there bade Omoikane, child of Takamimusubi-no-kami, to ponder^[2]. Amaterasu is at the center of the crisis, Ame-no-tajikarao is the one who reaches out at the end, and Ame-no-uzume is the one who turns the situation with her dance. However, it is Omoikane who places them all within the same strategy. He is not just a "god of wisdom," but the architect of crisis management.

Omoikane's wisdom manifests not as quiet abstraction, but as highly specific procedural arrangements. After his deliberation, he has the long-crowing roosters of Tokoyo crow, takes hard rocks and iron of heaven, seeks the smith Amatsu-mara, has Ishikoridome make a mirror, has Tamanoya make magatama jewels, and tasks Ame-no-koyane and Futodama with divination, reciting norito prayers, and holding gohei offerings. These are not disjointed props. Just as Kokugakuin University's artifact commentary reads the Heavenly Rock Cave myth as an origin tale of rituals equipped with mirrors, jewels, cloth, iron products, and divination bones^[6], Omoikane's plan is the compositional power to organize ritual technology into a single drama.

The core of this compositional power is not in "persuading" Amaterasu, but in creating a situation where she approaches the doorway on her own. The mirror shows Amaterasu a strange presence outside, the jewels and cloth decorate the sacred space, the prayers establish order as words, and the dance and laughter break the enclosed atmosphere. Ame-no-tajikarao hides beside the door, but the only moment he can act is when Amaterasu attempts to step outside slightly. In other words, Omoikane's strategy is not one of coercion. It is a strategy to arrange the conditions that change the opponent's consciousness, creating a single point where the final force can act.

It is significant that the Kokugakuin University annotations connect the meaning of Omoikane's name to "possessing the wisdom of deep thought"^[2] from an alternate account in the Nihon Shoki. Thoughtfulness is not merely having a lot of knowledge. It is the ability to read the situation, the stakeholders, and the procedures, thinking about what order of actions will cause the maximum change with the minimum destruction. At the Heavenly Rock Cave, merely breaking the stone door with military force was not the solution. The sun goddess's reappearance had to be established as a ritual, a council, a laugh, and the act of looking into a mirror. Omoikane is the god who reads that totality.

His reappearance during the Descent of the Heavenly Grandson shows that this god's wisdom was not a one-time cleverness. Amaterasu-Omikami adds Tokoyo-no-omoikane-no-kami, Ame-no-tajikarao, and Ame-no-ishikadowake-no-kami^[3] alongside the sacred treasures, and commands that the mirror be worshipped as her own spirit. Furthermore, Omoikane is given the role of "taking charge of preceding affairs and governing."^[3] The god who assembled the ritual before the rock cave takes charge of the rituals centered around the mirror on earth, and engages in governance. Here, "thinking" transitions from mythological crisis response to the intellect of operating institutions.

Ame-no-yagokoro-omoikane-no-mikoto at the Chusha of Togakushi Shrine preserves this character as a tactical god within mountain worship. The official history states the Chusha's deity is Ame-no-yagokoro-omoikane-no-mikoto^[4], describing him as the god who originated the Iwato Kagura (sacred dance)^[4] during the Heavenly Rock Cave event. Here, Omoikane is not simply a smart god, but the inventor of rituals including performing arts. The Iwato Kagura belongs not only to Uzume who danced it, but also to the wisdom of Omoikane who constructed that setting. The Chusha's faith in academic success and business prosperity can be read as a faith in the power to synergize multiple conditions, beyond the simple wish that wisdom works well for exams or commerce.

Yagokoro-omoikane-no-mikoto at Chichibu Shrine provides further political and regional context. The official page identifies this god as the ancestral god of politics, scholarship, industry, and good fortune^[5], marking Chichibu-hiko-no-mikoto's enshrinement of his ancestral god as the origin of the shrine. The combination of politics, scholarship, and industry is very close to Omoikane's essence. Politics is the intellect to position people, scholarship is the intellect to establish logic, and industry is the intellect to actualize materials and techniques. The god who combined mirrors, jewels, iron, divination, and personnel allocation at the Heavenly Rock Cave being worshipped as the ancestral god of these three domains in later eras shows a perfect alignment between his mythological deeds and his divine virtues in faith.

Reducing Omoikane to a light metaphor like "brain trust" obscures the gravity of the myth. He is a god who, when darkness covered the world, did not fight the darkness itself, but designed a space so the world could regain its brightness on its own. Amaterasu, Uzume, Tajikarao, the mirror maker, the jewel maker, norito, divination, and the sakaki tree—only when all of these are aligned does the rock cave open. Omoikane's power is not individual cleverness, but the power to weave multiple forces into a single restoration. What is needed in a deadlocked situation is neither shouting nor destruction, but the intellect to find the sequence. Omoikane is the god of that quiet sequence.