Events on the trip took an unexpected turn for the younger brother. Forced by his older brother to join a trip with his brother and his wife, he reluctantly agreed—and when he learned his brother's wife was Erika, his excitement quietly rose. Despite being pushed around by his older brother's impulsive personality, the group finally arrived at a hot spring inn. As he watched his brother and Erika affectionately spending time together, the younger brother couldn't help but keep his eyes on her. As night deepened and the three prepared for bed, the younger brother found himself unable to sleep, his thoughts consumed by Erika. Seeing her lying beside his brother, his restraint quickly reached its limit.