Justice Minister Yoshihisa Furukawa said Tomohiro Kato had undertaken "meticulous preparation" for the attack that killed seven people and displayed a "strong intent to kill".
The Southeast Asian country has mandatory death penalty for some offences, including drug trafficking and murder, while the law also allows the punishment for some other crimes at the court's discretion.
The number of executed surpassed even the toll of a January 1980 mass execution for the 63 militants convicted of seizing the Grand Mosque in Mecca in 1979.
President Julius Maada Bio has signed the abolition bill during a ceremony in the capital Freetown after lawmakers approved the text in July.
The move comes after a federal lawsuit challenged the use of pentobarbital, the drug used for lethal injection.
No woman has been hanged in India by the justice system since 1955.
Supreme Court orders Kanizan Bibi and Imdad Ali to be transferred to a mental health facility and asks for the case of Ghulam Abbas, a third inmate facing execution, to be reviewed in a landmark judgment hailed by rights groups.
An Australian woman sentenced to death for drug-trafficking in Malaysia was acquitted, after the Federal Court in Kuala Lumpur quashed her earlier conviction by a lower court.
Murtaja Qureiris, now 18, is a youth who has been detained since he was 13 years old in the Saudi juvenile detention and prison system, which lack basic human amenities and where he was subjected to torture and solitary confinement.
Rights groups put the number of those killed by Riyadh this year at 107 with Amnesty International calling the surge a 'bloody execution spree'.
If history is anything to go by then Saudi Arabia's executions of thirty-seven Saudis, most believed to be Shia, could incite anger in the region and a response from Iran.
Amnesty International says 2018 saw a dramatic decrease in the number executions across the globe, but named the five countries that killed the most last year.
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