My grandparents lived at 13-1 Konpira-cho. Nothing written jn Japanese.
Thank you. The area does look right. I give writing a shot.That address still exists and it doesn't look like the area has been demolished and rebuilt anytime since 1969. Go to Google Maps, enable satellite photos, and see if the area looks familiar.
There is a fairly good chance you have some relatives still living there. Have you tried writing them?