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Their meetings were said to be a mix of political debate, military advice, and genuine companionship. One famous variation claims that on the eve of the Fourth Battle of Kawanakajima (1561), Kenshin visited Shingen to warn him of his own battle plan out of respect, ensuring the fight would be worthy of their mutual honor. Modern scholars debate the nature of this relationship. During the Sengoku period, bonds between daimyō were often sealed through blood brotherhood, adoption, or intimate friendships ( shudō – the "way of youths," a Japanese tradition of pederastic or homoerotic bonds between a warrior and a young man).

It seems you are asking for a (also known as Yotogi-michi or Yotsugidō ). yotogimichi

The term Yotogi refers to a woman sharing a nobleman's bed at night. In the legend, Kenshin takes the feminine role—visiting Shingen at night to discuss strategy, philosophy, or perhaps something deeper. The story goes that a narrow, winding path existed between the two generals’ camps, hidden by thick pines and morning mist. On many nights, Kenshin—disguised as a common soldier or a wandering nun (a popular motif in kabuki)—would travel alone or with a single attendant to Shingen’s headquarters. Their meetings were said to be a mix