Illegal residence in Japan for 2 years before 15. Can I still travel to Japan now?

If you travel with a group in Japan, even if the embassy information is updated and the visa is not refused, you may be refused entry to Japan.

This situation may not give you an accurate answer. First, there is such an example. I stayed illegally before, but I changed my passport number, signed it, paid a deposit to the travel agency and entered the country smoothly. There are also cases where tourists who have never stayed in Japan illegally are still refused entry by the Japanese entry-exit administration.

Personally, I suggest you travel to some developed countries first, such as Europe and Australia. The more exit records, the less likely it is to be suspected.