Your MG is awesome and based on the leaves it is an Ipomoea nil. Possibly a Botan-Type. Let me look through my Japanese MG photos and see if I can spot anything similar. If all else fails, I have friends in Japan that I can get to translate your label
Spot on, Dany! I think your eagle eye picked out the closest Q vine that it might be. Small bloom from the photo, it appears. I like the color of the leaves. Love the light yellow-green foliage, Carlos. Nice bloom as well! :-)
Showed it to a native Japanese speaker and she believes that it appears to be part of a display and not the name of the cultivar. Usually is Japan, these kind of sayings or statements are painted/etched on stones and displayed often.