Sachiko, Princess Hisa

However, at 9 pm on March 4, temperature rose again to around 39°C she was in critical condition, and sepsis was suspected. The empress and her ladies-in-waiting stayed up all night to nurse her. At the same time, her father had a fever, but this was due to a cold. By the afternoon of the 5th, her physical condition seemed to have recovered, but after the morning of the 6th, the high fever continued again. The events of for the Empress's birthday on that day were cancelled, and her maternal grandparents, who were staying at Atami, were requested to return to Tokyo by midnight.

At 4 pm on the 7th, she was diagnosed with a complication of sepsis. At 3:30 am on the following day, she became critically ill, and at 3:38 am she passed away in Akasaka Palace. She was 5 months and 28 days old.

Sachiko died in 1928 of pneumonia, aged 5 months and 28 days.

She was breast-fed by her mother and was growing well, and on March 3, 1928, was planning on attending her first festival on a grand scale. Her parents prepared 30 kinds of hina sweets, and gifts were prepared from the Kuninomiya family, the family house of Empress Kōjun, and from the princesses of Emperor Meiji who became consorts of the Imperial Palace. The princesses are Princess Masako Takeda, Fusako Kitashirakawa, Princess Nobuko Asaka, and Toshiko Higashikuni, who would be considered "great aunts" of Sachiko.

Sachiko, Princess Hisa (久宮祐子内親王, Hisa-no-miya Sachiko Naishinnō, 10 September 1927 – 8 March 1928) was the second daughter and child of Emperor Shōwa and his wife, Empress Kōjun. Her personal name is Sachiko, and her title is Hisa-no-miya. She was the older sister of Emperor Akihito, Imperial Prince Masahito, and Imperial Princess Shigeko is her older sister; her younger siblings were born after her death. She was the aunt of Emperor Naruhito and Crown Prince Fumihito.

On September 10, 1927, at 4:42 a.m., she was born in Akasaka Palace as the second child and second princess of Emperor Shōwa and Empress Kōjun. She was 50.8 cm tall and weighed 3300 grams.