The record consists of one paragraph in Michael Newton's encyclopaedia of serial killers: born 1914, robbed and killed elderly victims in their homes, hanged on May 31, 1985. Nothing else is given, and nothing further has been located.
No dates for the killings, no location beyond Japan, no method, no victim names, no trial record. Japanese executions are announced by the Ministry of Justice with minimal detail, and the case does not appear in the accessible Japanese-language material on post-war capital cases.
An execution in 1985 for killings decades earlier is plausible, since capital cases in Japan routinely spend twenty or thirty years in appeal and then in the queue for the order, but nothing here can be checked. This entry is retained as a name on an execution list and should not be cited for anything beyond that.