Good behavior: applicants need to have good behavior and no criminal record.
Have enough assets or skills to make a living: applicants need to have enough assets or skills to live in Japan and will not become a burden to society.
It is considered to be in Japan's interest: the applicant's long-term residence needs are in Japan's national interest.
There must be an organizer in Japan, usually an employer. But there are some exceptions, such as issuing visas to journalists or artists, which generally do not require employers.
The organizer is called "visa guarantor", and applicants for long-term visas must ensure the safety of their sponsors before applying for visas.