The relationship between Takasugi Shinsuke and Katsura Kotaro is like that book. From acquaintance in the ignorant period to going to the battlefield together. After so many years, each other has become a habit, became blood, and became part of each other's bodies. Then fate separated them alive and went to opposite paths, just like the book that was cut off, and there was no more content. (From chapter12)
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