If you are interested in getting permanent residency in Japan. Immgration Services Agency has consulation office in Tokyo where you can go to consult with your need.
Their office is in front of JR Yotsuya station in Comore Yotsuya Building on 13th floor.
https://office.mec.co.jp/en/search/detail/0136C4
Opening hours: Weekdays 9:00 a.m. to 5:00 p.m. (excluding national holidays and year-end and New Year holidays)
Cost: Free (free with an interpreter)
Face-to-face (visit FRESC directly for consultation)
Place: Comore Yotsuya Yotsuya Tower 13th floor
Inside the Foreign Resident Support Center (FRESC)
Click here for details
Telephone reservation: 03-5363-3025 (supports 18 languages)