This is another great use of expressive typography. Using the “o” instead of any other letter was the best choice with this word. The “o” in this case gives us the “aw” sound when saying the word “drop” rather than a long o sound like the word “stove”. Great job on this one.
I actually this is more offensive than it is an interesting/effective design. This is not hopeful; this is pairing Japan with a giant wave, and attempting to encourage people by using the same imagery as the waves that ruined the lives of thousands upon thousands... I don't know about that.