Shinji lives with his mother after his father passed away. One day, his mother was hospitalized with appendicitis. Shinji had to live alone for a while. Just when I thought that, his aunt Yuko came to see how Shinji was doing. Shinji was fascinated by Yuuko, who skillfully dried the piled up laundry and put the dishes away on the shelf. No, he was fascinated by Yuuko's armpits. Shinji couldn't help but worry about his aunt's beautiful armpits.
