| Schedule of accounts receivable, net |
| | | | | | | | | | | | June 30, | | June 30, | | June 30, | | | 2025 | | 2026 | | 2026 | Third Parties | | RMB | | RMB | | US Dollars | Trade accounts receivable | | ¥ | 37,916,569 | | ¥ | 50,666,009 | | $ | 7,467,245 | Allowance for credit losses | | | (2,064,085) | | | (4,523,560) | | | (666,690) | Total third-parties, net | | ¥ | 35,852,484 | | ¥ | 46,142,449 | | $ | 6,800,555 |
| | | | | | | | | | | | June 30, | | June 30, | | June 30, | | | 2025 | | 2026 | | 2026 | Third Parties- long-term | | RMB | | RMB | | US Dollars | Trade accounts receivable | | ¥ | 886,267 | | ¥ | 244,800 | | $ | 36,079 | Allowance for credit losses | | | (886,267) | | | (244,800) | | | (36,079) | Total third-parties, net | | ¥ | — | | ¥ | — | | $ | — |
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| Schedule of movement of allowance for credit losses |
| | | | | | | | | | | | June 30, | | June 30, | | June 30, | | | 2025 | | 2026 | | 2026 | | | RMB | | RMB | | US Dollars | Beginning balance | | ¥ | 1,968,461 | | ¥ | 2,950,352 | | $ | 434,828 | Charge to credit losses | | | 981,891 | | | 1,818,008 | | | 267,941 | Ending balance | | ¥ | 2,950,352 | | ¥ | 4,768,360 | | $ | 702,769 |
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