Japan had a lot more wood-only city buildings back then compared to the colder climate in Europe, where more massive stone architecture was common. In Europe, cellars are also common/default, unlike in Japan.
During high heat firestorms, most of the wooden material burns up and the ash gets carried away. The photo definitely shows cleanup and very likely was not taken the day after the bombing, but a single firestorm definitely can produce these results, much like other examples in Cologne, Hamburg, Dresden, Würzburg,... Except those had much more stone rubble standing afterwards.
Oddly, this also seems like a very weird Nazi token. Hitler's name is misspelled: he never was called "Adolph", ever.
Also, the Nazi swastika is always supposed to be tilted at 45°, also not the case here.
Almost if it's not authentic at all.