Yamagata February, The city was approaching the end of winter. I was aiming for the summit of "Mt.zao" from the night. There is a beautiful crater lake which is still active as a volcano, called "Goshikinuma", and in the summer it is a beautiful lake of emerald green. It was covered with strong wind and fog, but it showed its appearance in a momentary fine weather. The crater lake where the accumulated snow began to melt was like a blue moon.