元祿美少年記.

On February 4th of the 16th year of the Genroku era, Yatō Uemon no Shichi reminisces while waiting his turn for seppuku at the Mizuno residence. When news of his lord, Asano Naganori, attacking Kira Yoshinaka in the palace reached Akō, Uemon no Shichi was sixteen. The family elder, Ōishi Kuranosuke, determined to avenge, gathered allies, but Uemon no Shichi's father, Chōsuke, being sickly and considered too young, was not included. Chōsuke committed suicide.