Historical facts show that Kira Kozuke no Suke sent massive bills for things he secretly purchased as well as construction work done in his house to the Uesugi family of Yonezawa Domain where his son was acting as the lord, and troubled the accounting officer of the Uesugi family.
また史実を見ると、吉良上野介は、息子が当主となっている米沢藩上杉家に対して吉良家の大量の買い掛け金や自邸の普請費用を押し付けて、上杉家勘定方を困らせている。