Do I have a chance to get a Citizenship in Japan?
Problem/goal: How can I get a citizenship in Japan even if it is to work for citizenship
Context: Hi! I am a 20-year-old Philippine citizen born after my parents married. They got separated, but not divorced and I don't have a way to communicate him (my father is a Japanese and my mother is a Filipina). I have my PSA Birth Certificate to prove direct lineage, my parents' Philippine Marriage Certificate, pictures, and two addresses from the documents. Unfortunately I don't have a Kosekitohon and I also don't know whether I am registered in my father's kosekitohon after I was born. Do I still have a chance to get citizenship even if it is work to citizenship. Or if there is someone that can help my situation. Also can a Gyoseishoshi help my case or a lawyer? Kindly give me some advice, please.
Any response can greatly help me.
Thank you very much in advance!