| Dec 31,
2019 | Dec 31,
2020 | Dec 31,
2021 | Dec 31,
2022 | Dec 31,
2023 | Dec 31,
2024 |
|---|
| Cash and deposits | - | 476 | 567 | 946 | 944 | 2,016 |
|---|
| Accounts receivable - trade | - | 396 | 399 | 410 | 577 | 1,282 |
|---|
| Prepaid expenses | - | 28 | 43 | 44 | 56 | 138 |
|---|
| Other | - | 12 | 8 | 14 | 16 | 31 |
|---|
| Allowance for doubtful accounts | - | - | - | - | - | -8 |
|---|
| Current assets | - | 912 | 1,017 | 1,415 | 1,592 | 3,459 |
|---|
| Current assets | - | 912 | 1,017 | 1,415 | 1,592 | 3,459 |
|---|
| Buildings, net | - | 42 | 45 | 42 | 45 | 75 |
|---|
| Vehicles, net | - | 3 | 2 | 4 | 11 | 9 |
|---|
| Tools, furniture and fixtures, net | - | 4 | 4 | 1 | 3 | 13 |
|---|
| Land | - | 1 | 1 | 1 | 1 | 1 |
|---|
| Leased assets, net | - | 7 | 5 | 5 | 17 | 14 |
|---|
| Property, plant and equipment | - | 56 | 57 | 53 | 76 | 113 |
|---|
| Other | - | - | - | - | - | 0 |
|---|
| Property, plant and equipment | - | 56 | 57 | 53 | 76 | 113 |
|---|
| Goodwill | - | - | - | - | - | 865 |
|---|
| Software | - | 19 | 147 | 136 | 120 | 98 |
|---|
| Software | - | 19 | 147 | 136 | 120 | 98 |
|---|
| Customer related assets | - | 207 | 197 | 206 | 284 | 287 |
|---|
| Customer related assets | - | 207 | 197 | 206 | 284 | 287 |
|---|
| Other | - | - | 9 | 7 | 4 | 3 |
|---|
| Intangible assets | - | 300 | 362 | 369 | 408 | 1,252 |
|---|
| Investment securities | - | 0 | 0 | 0 | 0 | 0 |
|---|
| Investments in capital | - | 0 | 0 | 0 | 0 | 0 |
|---|
| Investments in capital | - | 0 | 0 | 0 | 0 | 0 |
|---|
| Long-term prepaid expenses | - | 1 | 1 | 1 | 1 | 20 |
|---|
| Long-term prepaid expenses | - | 1 | 1 | 1 | 1 | 20 |
|---|
| Long-term loans receivable | - | 4 | 1 | 1 | 0 | 1 |
|---|
| Long-term loans receivable | - | 4 | 1 | 1 | 0 | 1 |
|---|
| Leasehold and guarantee deposits | - | 37 | 33 | 30 | 30 | 113 |
|---|
| Leasehold and guarantee deposits | - | 37 | 33 | 30 | 30 | 113 |
|---|
| Deferred tax assets | - | 21 | 24 | 29 | 32 | 243 |
|---|
| Deferred tax assets | - | 21 | 24 | 29 | 32 | 243 |
|---|
| Other | - | 9 | 9 | 9 | 9 | 9 |
|---|
| Other | - | 9 | 9 | 9 | 9 | 9 |
|---|
| Allowance for doubtful accounts | - | -0 | -0 | -0 | -0 | -0 |
|---|
| Allowance for doubtful accounts | - | -0 | -0 | -0 | -0 | -0 |
|---|
| Investments and other assets | - | 71 | 67 | 68 | 71 | 384 |
|---|
| Investments and other assets | - | 71 | 67 | 68 | 71 | 384 |
|---|
| Non-current assets | - | 427 | 485 | 490 | 556 | 1,750 |
|---|
| Assets | - | 1,339 | 1,503 | 1,905 | 2,148 | 5,208 |
|---|
| Current portion of long-term borrowings | - | 96 | 78 | 55 | 83 | 233 |
|---|
| Trade accounts payable | - | 261 | 311 | 375 | 410 | 1,675 |
|---|
| Lease liabilities | - | 2 | 4 | 7 | 9 | 11 |
|---|
| Accrued expenses | - | 34 | 34 | 35 | 42 | 70 |
|---|
| Trade accounts payable | - | 261 | 311 | 375 | 410 | 1,675 |
|---|
| Income taxes payable | - | 62 | 37 | 40 | 23 | 118 |
|---|
| Accrued expenses | - | 34 | 34 | 35 | 42 | 70 |
|---|
| Accrued consumption taxes | - | 65 | 51 | 49 | 45 | 130 |
|---|
| Income taxes payable | - | 62 | 37 | 40 | 23 | 118 |
|---|
| Deposits received | - | 22 | 22 | 20 | 25 | 265 |
|---|
| Accrued consumption taxes | - | 65 | 51 | 49 | 45 | 130 |
|---|
| Refund liabilities of commision | - | 31 | 36 | 43 | 50 | 340 |
|---|
| Deposits received | - | 22 | 22 | 20 | 25 | 265 |
|---|
| Provision for loss on relocation | - | - | - | - | - | 2 |
|---|
| Refund liabilities of commision | - | 31 | 36 | 43 | 50 | 340 |
|---|
| Other | - | 3 | 1 | 1 | 2 | 1 |
|---|
| Provision for bonuses | - | - | - | - | - | 87 |
|---|
| Current liabilities | - | 585 | 622 | 673 | 689 | 2,938 |
|---|
| Provision for loss on relocation | - | - | - | - | - | 2 |
|---|
| Asset retirement obligations | - | - | - | - | - | 6 |
|---|
| Other | - | 3 | 1 | 1 | 2 | 1 |
|---|
| Current liabilities | - | 585 | 622 | 673 | 689 | 2,938 |
|---|
| Long-term borrowings | - | 147 | 105 | 131 | 236 | 957 |
|---|
| Lease liabilities | - | 6 | 11 | 5 | 14 | 5 |
|---|
| Non-current liabilities | - | 152 | 117 | 136 | 250 | 962 |
|---|
| Liabilities | - | 737 | 739 | 809 | 938 | 3,900 |
|---|
| Share capital | - | 231 | 231 | 334 | 336 | 336 |
|---|
| Capital surplus | - | 141 | 141 | 244 | 246 | 246 |
|---|
| Capital surplus | - | 141 | 141 | 244 | 246 | 246 |
|---|
| Retained earnings | - | 233 | 389 | 501 | 603 | 656 |
|---|
| Retained earnings | - | 233 | 389 | 501 | 603 | 656 |
|---|
| Treasury shares | - | - | - | - | -0 | -0 |
|---|
| Shareholders' equity | - | 605 | 761 | 1,079 | 1,185 | 1,238 |
|---|
| Valuation difference on available-for-sale securities | - | - | - | - | - | 0 |
|---|
| Valuation and translation adjustments | - | -3 | 3 | 17 | 25 | 43 |
|---|
| Foreign currency translation adjustment | - | -3 | 3 | 17 | 25 | 42 |
|---|
| Valuation and translation adjustments | - | -3 | 3 | 17 | 25 | 43 |
|---|
| Share acquisition rights | - | - | - | - | - | 28 |
|---|
| Net assets | 238 | 602 | 764 | 1,096 | 1,210 | 1,309 |
|---|
| Liabilities and net assets | - | 1,339 | 1,503 | 1,905 | 2,148 | 5,208 |
|---|