could u give me some advice. please respond if u have time, it would be so much help, thank you in advance :))

hello! I am half filipino and japanese. I am hopeless about going to japan through koseki since I contacted the japanese embassy through email then someone from embassy called me and told me that I can’t go to japan if I’m not registered in koseki. I asked if I could still register my name and he said no and explained to me that it is only allowed to be registered a few days after birth. I asked again if a psa or birth certificate would work but he firmly said no. I still asked if there’s any other way and he said there’s none except koseki. Actually, I was so offended and devastated at that time. He was saying it as if I have no rights to be in japan and I’m planning to hunt him if I’m already capable enough (kidding😭😭 I was just really really hurt at that time). But still, I want to go and live there and I’m planning to enter through jlpt. As I am preparing for jlpt, I will also take a college degree before moving out for good here in philippines. I’m planning to take bsba since it’s aligned with what I took in shs (abm) and I also want to enter the business industry. However, if I’m not mistaken, a philippine degree cannot be used in japan right??? there gotta be a degree that will somehow work, so please help me find what kind of degree is the most essential and most practical that I can use in japan for work.

by yumixzo