Great even if you don’t read Japanese!
I recently travelled to Japan for 2 weeks with my 8 month old and I’d read that you’re okay to breastfeed in public with a cover but I was a little nervous nonetheless. This app was really great for finding a “baby room” (you could even say this in English to people there and they’ll understand although it may not always get you a nursing area). I found every space on the map easily and it made our trip stress free because there was always some diaper changing or nursing facility very close by (props to Japan for being so accommodating to families with so many spaces).