Atsushi stands alone, carrying a backpack, quietly gazing at the distant landscape. His older brother had passed away five years ago. While Atsushi was traveling overseas, he received news that his brother was on the verge of death and rushed back to Japan, but his brother had already died. Their relationship wasn't particularly close, yet upon learning of his brother's death, Atsushi found himself unable to stop crying. It wasn't just sadness—he felt as though he had made a silent vow deep inside. That vow was for his brother, and for his sister-in-law.