| Mar 31,
2013 | Mar 31,
2014 | Mar 31,
2015 | Mar 31,
2016 | Mar 31,
2017 | Mar 31,
2018 | Mar 31,
2019 | Mar 31,
2020 | Mar 31,
2021 | Mar 31,
2022 | Mar 31,
2023 | Mar 31,
2024 |
|---|
| Profit (loss) before income taxes | -509 | -1,383 | -74 | 168 | 94 | -240 | -456 | 32 | -87 | 32 | 417 | 3,278 |
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| Depreciation | 76 | 67 | 55 | 53 | 53 | 70 | 84 | 73 | 80 | 72 | 131 | 138 |
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| Impairment losses | 109 | 1,078 | 17 | - | - | 139 | 225 | - | 83 | 74 | 155 | 51 |
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| Increase (decrease) in allowance for doubtful accounts | -4 | 2 | -0 | 1 | -11 | 0 | -0 | 9 | 5 | 1 | 2 | -6 |
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| Increase (decrease) in provision for bonuses | -8 | -0 | 7 | 8 | -11 | 10 | -6 | 1 | 2 | 14 | 9 | 200 |
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| Increase (decrease) in retirement benefit liability | - | 9 | -65 | -42 | 2 | -8 | -23 | -21 | -7 | 4 | 2 | 4 |
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| Interest and dividend income | -6 | -7 | -8 | -5 | -3 | -4 | -3 | -4 | -3 | -3 | -2 | -9 |
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| Interest expenses | 1 | 1 | 4 | 8 | 9 | 9 | 8 | 4 | 3 | 3 | 6 | 6 |
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| Foreign exchange losses (gains) | -18 | -43 | -45 | -9 | -25 | -8 | -8 | -8 | -14 | -47 | -25 | -37 |
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| Loss (gain) on sale of non-current assets | - | -0 | -9 | -3 | -93 | -0 | - | -0 | -0 | - | 2 | -1 |
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| Loss on retirement of non-current assets | 2 | 1 | 3 | 0 | 16 | 1 | 2 | 4 | 6 | 0 | 5 | 38 |
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| Loss on tax purpose reduction entry of non-current assets | - | - | - | - | - | - | - | - | 33 | 20 | 12 | 744 |
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| Subsidy income | - | - | - | - | - | - | - | - | -39 | -29 | -21 | -747 |
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| Loss on withdrawal from business | - | - | 64 | 16 | - | - | - | - | - | - | - | 61 |
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| Office transfer expenses | - | - | - | - | 11 | - | 8 | - | - | - | - | 21 |
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| Share issuance costs | - | - | 29 | - | - | 0 | 1 | 2 | - | 1 | 2 | 7 |
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| Gain on reversal of share acquisition rights | - | - | - | - | - | - | - | -1 | - | - | -0 | -3 |
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| Issuance cost of subscription rights to shares | - | 3 | - | 3 | - | 5 | - | 6 | - | 4 | - | 4 |
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| Decrease (increase) in trade receivables | 95 | -54 | -372 | 40 | 79 | -199 | -56 | 157 | -211 | -312 | -477 | -581 |
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| Decrease (increase) in inventories | 47 | -24 | -66 | 136 | -114 | 241 | -7 | 37 | 14 | -194 | -213 | -304 |
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| Increase (decrease) in trade payables | -29 | 24 | 135 | -22 | -33 | 51 | 9 | -105 | 58 | 31 | 190 | -364 |
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| Increase (decrease) in advances received | - | - | - | - | - | - | - | - | - | 99 | 301 | -344 |
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| Other, net | -14 | -4 | -13 | -73 | -7 | -80 | -34 | 27 | 127 | -30 | 39 | -116 |
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| Subtotal | -89 | -257 | -190 | 275 | -6 | 96 | -48 | 224 | 50 | -260 | 535 | 2,041 |
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| Interest and dividends received | 5 | 7 | 8 | 5 | 3 | 4 | 3 | 4 | 3 | 3 | 2 | 9 |
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| Interest paid | -1 | -1 | -4 | -8 | -9 | -9 | -8 | -4 | -3 | -3 | -6 | -6 |
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| Subsidies received | - | - | - | - | - | - | - | - | 39 | 29 | 21 | 747 |
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| Income taxes paid | -17 | -5 | -29 | -33 | -47 | -40 | -52 | -41 | -44 | -49 | -105 | -542 |
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| Net cash provided by (used in) operating activities | -220 | -331 | -343 | 238 | -59 | 50 | -105 | 183 | 45 | -281 | 448 | 2,250 |
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| Payments into time deposits | -576 | -410 | -377 | -226 | -175 | -200 | -232 | -200 | -200 | -200 | -257 | -718 |
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| Proceeds from withdrawal of time deposits | 461 | 510 | 427 | 303 | 150 | 280 | 200 | 231 | 200 | 200 | 200 | 659 |
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| Purchase of property, plant and equipment | -21 | -51 | -33 | -64 | -644 | -121 | -135 | -68 | -136 | -339 | -987 | -1,070 |
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| Proceeds from sale of property, plant and equipment | - | 1 | 9 | 3 | 588 | 0 | - | 463 | 0 | - | 1 | 1 |
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| Purchase of long-term prepaid expenses | - | - | - | - | - | - | - | - | - | - | - | -154 |
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| Other, net | 3 | -1 | -10 | -15 | -25 | -37 | -33 | -5 | 0 | -8 | -6 | 1 |
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| Net cash provided by (used in) investing activities | -135 | 43 | -353 | -88 | -107 | -527 | -228 | 423 | -135 | -347 | -1,049 | -1,283 |
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| Net increase (decrease) in short-term borrowings | -4 | - | 304 | -300 | 170 | 145 | 492 | -542 | - | -73 | -29 | 148 |
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| Proceeds from long-term borrowings | - | - | 300 | 300 | 80 | 530 | 100 | - | - | 500 | 80 | - |
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| Repayments of long-term borrowings | - | - | -17 | -135 | -192 | -194 | -626 | -76 | -41 | -16 | -16 | -516 |
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| Proceeds from issuance of shares resulting from exercise of share acquisition rights | - | - | 408 | - | - | - | 346 | 437 | - | 135 | 404 | 1,739 |
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| Proceeds from issuance of share acquisition rights | - | - | - | - | - | 6 | - | - | - | 1 | - | 33 |
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| Net cash provided by (used in) financing activities | -28 | -25 | 971 | -133 | 36 | 488 | 311 | -182 | -41 | 548 | 439 | 1,403 |
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| Effect of exchange rate change on cash and cash equivalents | 7 | 33 | 35 | 8 | 23 | 11 | 9 | 11 | 15 | 70 | 32 | 55 |
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| Net increase (decrease) in cash and cash equivalents | -376 | -280 | 310 | 26 | -107 | 21 | -13 | 435 | -116 | -10 | -130 | 2,425 |
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