graph TD
    subgraph "証券総合取引口座 (日本円)"
        A[お客様の銀行口座] --> B["証券総合取引口座 (日本円)"]
        B --> C[日本株買付・売却]
        B --> D[投資信託買付・売却]
        B -- 資金振替 --> E["外国株取引口座 (日本円)"]
        C -- 売却代金 --> B
        D -- 売却代金 --> B
    end
    subgraph 外国株取引口座
        E["外国株取引口座 (日本円)"] -- 為替振替 (手動) / 円貨決済 (自動) --> F["外国株取引口座 (米ドル)"]
        F --> G[米国株買付・売却]
        G -- 売却代金 --> F
        G -- 配当金 --> F
        F -- 為替振替 --> E
    end
    style B fill:#e0f2f7,stroke:#333,stroke-width:2px
    style E fill:#e0f2f7,stroke:#333,stroke-width:2px
    style F fill:#f7e0f2,stroke:#333,stroke-width:2px
    style G fill:#f7f2e0,stroke:#333,stroke-width:2px
    
          Created
          July 29, 2025 06:32 
        
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