| Summary of property and equipment, net |
| | | | | | | | | As of | | As of | | As of | | | December 31, | | June 30, | | June 30, | | | 2025 | | 2026 | | 2026 | | | RMB | | RMB | | US$ | Motor vehicle | | 496,185 | | 496,185 | | 73,129 | Office equipment | | 1,133,534 | | 1,068,308 | | 157,450 | Leasehold improvement | | 4,081,600 | | 4,245,023 | | 625,639 | Subtotal | | 5,711,319 | | 5,809,516 | | 856,218 | Less: accumulated depreciation | | (1,454,437) | | (2,263,896) | | (333,658) | Property and equipment, net | | 4,256,882 | | 3,545,620 | | 522,560 |
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