TOKYO — Japan has executed a man who murdered nine people in 2017, the first time since 2022 that the country has enacted capital punishment.The serial killings by Takahiro Shiraishi, dubbed the “TwitterTOKYO — Japan has executed a man who murdered nine people in 2017, the first time since 2022 that the country has enacted capital punishment.The serial killings by Takahiro Shiraishi, dubbed the “Twitter