Generally speaking, as a professional contracting agency, we don't recommend that guests arrange a complete 15 days, because if tourists can't leave Japan as scheduled due to natural reasons or force majeure (even natural disasters such as earthquakes, typhoons and rainstorms), they will be regarded as illegally staying.
The consequence of illegal detention is that it will be taken away by the immigration bureau and sent back to China according to the legal procedures of illegal detention. You need to buy a one-way ticket (in this case, the Japan Immigration Bureau won't buy discount tickets from airlines, but all of them are bought at full price, and almost all of them are more than 10000 yuan. . . . ), and the cost of repatriation (repatriation between the two countries). You will be detained and fined when you return home.
What's more, the deposit paid by tourists in travel agencies will be deducted in full, and may be recovered by travel agencies (once tourists stay in travel agencies, they will be punished by consulates, and they will generally be suspended from issuing visas for at least three months. )。