Extension of Stay Tourist Visa

Is there any reason you have been granted only 15 days? As a European citizen, when I go on holidays, I enter the country, get my stamp, and the maximum days in Japan allowed is always 90 days. I'm thinking it's strange it would be this different for someone from the Phillipines.

In any case I'm afraid the others in this thread are correct :c

@Kinlyu, The Philippines is not a visa-exempt country like Belgium. A Philippine citizen cannot just show up at a Japanese entry point and expect to be given a "temporary visitor" stamp. They must apply for a visa.

You are not asked to rebook a flight, just to change dates which shouldn't cost that much, only LCC is not possible to change, as many has said, you are willing to stay, but be prepared to accept the consequence.