During the 11th year of Showa, Hikari, a daughter of a mistress who was raised at the Hozumi house received a proposal. But she actually liked Kousuke, her distant cousin. However, she couldn't confess her feeling because she knew Suzuko, the legitimate daughter of her father's wife also liked him. Her twin sister, Akari, who was raised by another family gave her courage through letters they sent each other in secret. But what can they do now...?

Pada tahun ke-11 Showa, Hikari, anak seorang perempuan simpanan yang dibesarkan di rumah Hozumi menerima sebuah lamaran. Namun dia masih menaruh hati pada Kousuke, saudara jauhnya. Dia tak mampu berterus-terang kerana dia tahu bagaimana perasaan Suzuko, anak sah isteri ayahnya. Dia mendapat sokongan adik kembarnya, Akari yang dibesarkan oleh keluarga lain. Mereka masih berutus surat secara rahsia, tapi apa yang dapat mereka lakukan...?

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