This work is a sound installation based on the texts of “letters” written by women who graduated from a girls’ school in Tokyo in 1945, all addressed to a single former classmate.　The texts, written between March 1945 and the following year, are translated into the voices of contemporary young women. These multiple “voice parts” are layered polyphonically through multichannel speakers and are played back synchronically.

The term polyphonic derives from polyphony, a musical concept referring to a compositional form in which multiple independent voice parts (melodic lines or parts) overlap and proceed in harmonic relation to one another.br> In literature, polyphony refers to a narrative structure in which multiple characters—autonomous from the authorial voice—speak in their own right, coexisting without being unified into a single perspective.

Drawing on this polyphonic mode, the work treats each spoken voice reading the letters as an individual melodic line. Multiple timelines, arranged according to the dates on which the letters were written, are played back both synchronically and in chronological sequence. Each loudspeaker primarily emits the voice of a specific individual (with only one speaker presenting two voices, separated between the first and second halves of the piece).

From March 1945, through the defeat in August, and into the postwar period, the words written by these women intermittently converging and diverging, as if in dialogue.The larger currents of consciousness shared by these women in that historical moment, alongside the individual melodic lines that could never be fully shared, are released into the space of the present through the voices of contemporary women, who act as proxies in articulating multiple episodes and monologues.

The piano piece heard occasionally in the performance is Bach's 《The Well-Tempered Clavier, BWV 858》.Some performances are recorded separately for each part, and the sounds coming from each speaker become a piece of music for the first time in the installation place.According to the database of western music program kept in Japan Broadcasting Corporation, during the World War II, classical programs from the radio continued to be broadcast in Japan and piano solos had been also broadcasted.There are some descriptions about these classical programs in their letters.