往おう復ふく書しょ簡かん

noun

written correspondence; exchange of letters

Refers to the back-and-forth exchange of letters or written messages, often in a formal or literary context.

• 二人ふたりの往おう復ふく書しょ簡かんが本ほんにまとめられた。

  The correspondence between the two was compiled into a book.