The Merman, My Man
That was when I noticed a man dressed in a black kimono who looked rather familiar, and suddenly realized that he was a younger Bob.
If both Mary and Bob were here, what about Asura, the other major character of this story? It drove me to look around despite the difficulty, but I couldn’t find any merman with a purple tail after looking through the other glass tanks.
This means that Asura had yet to show up, and I could more or less deduce the date—if Hiroshima had been nuked, the Japanese wouldn’t have had the spare time to study merfolk. In other words, I had arrived at this dimension before the Second World War… or before Hiroshima was nuked, to be precise.