Daisuke, a young man staying with his older brother and his wife, was asked by his sister-in-law, Lisa, to help clean the air conditioner filters one day. Daisuke watched as his sister-in-law worked, stretching high on a caterpillar, and while supporting the caterpillar, looked up from below. He was captivated by the breathtaking sight that suddenly came into his field of vision.
