The tourist visa (or temporary visitor status) allows you to enter Japan for tourism, visiting family or friends, or short-term travel purposes.
It is not a visa for working or long-term studies. It is simply intended for traveling, exploring the country, and staying legally for a limited period of time.

Citizens of Spain and many Latin American countries can enter Japan without applying for a visa in advance for stays of up to 90 days.
The exact period is determined by immigration officers upon arrival at the airport. In most cases, 90 days are granted, but it always depends on the officer’s discretion.
In most cases, tourist status CANNOT be extended within Japan. It is designed for short and temporary stays.
Some nationalities may request an exceptional extension, but this is not guaranteed. If you plan to stay longer, it is better to apply for a different type of visa before traveling.
Even if you do not need to apply for a visa beforehand, you must meet certain requirements: a valid passport, a return or onward ticket, and proof that you have sufficient funds for your stay.
Immigration officers may ask questions about where you will stay, how long you plan to remain, and the purpose of your visit. It is usually straightforward, but it is important to have clear and accurate information prepared.

Working is strictly prohibited under any circumstances, including remote work for foreign companies while physically present in Japan.
It also does not allow enrollment in long-term studies or directly changing to a work visa without leaving the country (except in very specific cases).
Do not attempt to chain multiple entries and exits in order to remain in Japan continuously as a tourist. Immigration authorities may detect this and deny you entry.
If your real intention is to live, study, or work in Japan, it is best to apply for the appropriate visa from the beginning. The tourist visa is ideal for exploring the country and deciding whether you want to take the next step.