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What this application does, and what it deliberately does not do.

This application prepares the paperwork for a Japanese spouse visa. It asks plain questions once, keeps the answers in one place, and writes them onto the Immigration Services Agency's own forms — the actual published files, not reconstructions.

What it does: fills the application form, the letter of guarantee and the questionnaire; shows you a red-ink preview so you can see which box each answer landed in before anything is filed; produces a summary of everything you said; and lists the supporting documents you must obtain yourself.

What it does not do: give legal advice, decide your case, or file anything on your behalf. It leaves blank every field the forms require to be handwritten, and it will not invent an answer you did not give. Where your situation is unusual — a previous refusal, an overstay, a criminal penalty — take the prepared bundle to a qualified 行政書士 (administrative scrivener) or lawyer rather than filing on the strength of a generated form.