Japanese literature I have a sister (9) Futaba Bunko

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Japanese Literature
Futaba Bunko / OHIRA Shota, the third son of a doctor's family, gave birth to a younger sister because a drug wholesaler in Nagasaki offered a marriage proposal that would be beneficial to his business in Edo, and his daughter, who was about to get married, first entered the OHIRA family as an adopted daughter in order to balance the family status. He fell in love with his younger sister at first sight. Moreover, the marriage proposal was broken off. He couldn't go back to Nagasaki, and to his younger sister who seemed to be uncomfortable, Shota used to loosen his strong heart by making jokes and so on. OOPS, I have an older brother and a younger sister? This is the 9th installment of the popular write-down series.