| 2025/3 | 2026/3 |
| Cash flows from operating activities | | |
| Profit before income taxes | 992,444 | 2,306,574 |
| Depreciation | 186,363 | 182,733 |
| Increase (decrease) in provision for bonuses | -31,217 | 125,910 |
| Increase (decrease) in allowance for doubtful accounts | 33,819 | -36,281 |
| Increase (decrease) in provision for product warranties | -546 | -1,628 |
| Increase (decrease) in provision for loss on construction contracts | 64,531 | -119,823 |
| Interest and dividend income | -46,598 | -50,963 |
| Compensation income | - | -326,670 |
| Subsidy income | - | -66,670 |
| Interest expenses | 3,475 | 1,423 |
| Loss (gain) on sale of investment securities | -50,193 | - |
| Loss (gain) on sale of non-current assets | 420 | - |
| Loss on retirement of non-current assets | 2,088 | 230 |
| Decrease (increase) in accounts receivable - trade, and contract assets | -43,831 | 731,214 |
| Decrease (increase) in inventories | -138,763 | 245,168 |
| Decrease (increase) in accounts receivable - other | -12,708 | 12,797 |
| Decrease (increase) in advance payments to suppliers | -261,303 | 308,545 |
| Increase (decrease) in trade payables | -105,538 | 225,785 |
| Increase/decrease in consumption taxes payable/consumption taxes refund receivable | 84,238 | -16,163 |
| Increase (decrease) in accounts payable - other | -61,549 | 116,717 |
| Increase (decrease) in contract liabilities | 1,359,365 | -2,462,636 |
| Other, net | 29,774 | 94,807 |
| Subtotal | 2,004,270 | 1,271,070 |
| Interest and dividends received | 46,598 | 50,895 |
| Interest paid | -3,412 | -1,423 |
| Proceeds from compensation | - | 326,670 |
| Subsidies received | - | 66,670 |
| Income taxes paid | -1,205,074 | -89,523 |
| Income taxes refund | 35,801 | 236,755 |
| Net cash provided by (used in) operating activities | 878,184 | 1,861,116 |
| Cash flows from investing activities | | |
| Purchase of property, plant and equipment | -106,212 | -717,311 |
| Proceeds from sale of property, plant and equipment | 11,937 | - |
| Purchase of intangible assets | -5,984 | -45,350 |
| Proceeds from sale of investment securities | 73,536 | - |
| Purchase of shares of unconsolidated subsidiaries | - | -70,000 |
| Other, net | 16,903 | 26,000 |
| Net cash provided by (used in) investing activities | -9,820 | -806,661 |
| Cash flows from financing activities | | |
| Net increase (decrease) in short-term borrowings | -200,000 | - |
| Repayments of long-term borrowings | -9,295 | -8,580 |
| Purchase of treasury shares | -73 | - |
| Repayments of lease liabilities | -8,378 | -9,821 |
| Dividends paid | -635,175 | -744,058 |
| Net cash provided by (used in) financing activities | -852,921 | -762,460 |
| Effect of exchange rate change on cash and cash equivalents | -1,546 | 3,155 |
| Net increase (decrease) in cash and cash equivalents | 13,896 | 295,149 |
| Cash and cash equivalents at beginning of period | 11,999,958 | 12,013,854 |
| Cash and cash equivalents at end of period | 12,013,854 | 12,309,004 |