As an adult, you will have to go through normal procedures for a Filipino to receive a tourist visa to visit Japan. That’s is the first step for attempting to meet your father. His assurance of a place to stay and financial assistance should it be necessary while in Japan, especially as your biological father, will be very helpful at the Japanese embassy.
There are multiple websites which provide more in depth and up to date information for Filipinos in your similar situation.
I am in no way an expert in this area, but it would seem very difficult even though your father is Japanese to receive citizenship. His recognition of you as his child would be a first positive step, but even then, it is no guarantee of obtaining citizenship at your current age and having grown up outside of Japan. Is there any chance that he would like to visit you first? His help would be essential (but maybe not forthcoming, I have to warn you.)
Have a look around at other websites which may provide you with better insight into your particular situation. Be positive while understanding it is a tough road. Best wishes!
]]>Please help me out with this..
Thank You Very Much,
Rica Haga