Forest of Fireflies

There is an old legend in the country grandfather's hometown. There are mountain gods and monsters living in the deep mountains. Once people break in, they will lose their minds and cannot find their way home. When I was six years old, I ignored the advice and chased the butterfly into the mountains. So I met him, a boy wearing a cat-face mask. He said that he was not human and would disappear as soon as he touched a human. I nodded in understanding. So we became friends, and every summer I would go to the mountains to spend time with him. As time went by, the friendship between us began to change quietly. We wanted to touch each other, but we didn't dare to because we cherished each other very much. At a temple fair held by monsters, a human child sneaked in at some point. He helped the human child up and his body began to become transparent. At this time, facing me who was panicking and crying, he smiled and said: "I can finally hug you." After he disappeared, I still kept my promise to meet him in the summer every year, and went to the deep mountains to constantly recall every moment I spent with him...