No, Hibari, you really do have a small chest.
As memory serves, Japanese C-cup would be a B-cup in America... and the higher sizes increment even more differently. A Japanese F would be an E in UK, and a DD in America...
They smol.
They not the smollest in the inn though.
@Pancakeza : None of them have gigantic boobs. They just have really narrow waists. Most manga seem to conveniently ignore that the average girl has a bit more bodymass all over.