A family succession comes into focus
Japan's Public Security Intelligence Agency (PSIA) identified Shoko Asahara's second son in July 2025 as the de facto leader of Aleph, the largest successor group to Aum Shinrikyo. The 31-year-old, whose name has not been disclosed, has been directing the organisation for nearly a decade with support from his mother, Tomoko Matsumoto, the widow of Aum's executed founder.
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The finding puts a family succession at the centre of Japan's continuing effort to monitor the movement responsible for the March 20, 1995, sarin attack on Tokyo's subway. Aleph is believed to have about 1,190 followers and roughly 20 facilities across Japan, despite restrictions on its premises, finances and recruitment activities.
Financial scrutiny has intensified alongside questions about leadership. Saitama police found tens of millions of yen in cash at the family's residence in April 2025, while Aleph has failed to pay compensation exceeding 1 billion yen required by a Supreme Court order. Authorities have designated the home shared by Asahara's widow and son as an Aleph facility.
For survivors and bereaved families, the concern reaches beyond who makes decisions inside the group. Aleph continues to recruit young people, many born after the subway attack, while maintaining reverence for Asahara. The agency's identification of his son as its effective leader has brought renewed attention to how much of the founder's authority and teachings survives.
How the second son gained authority
Asahara's second son has been involved in organisational decisions and religious rituals since at least 2014. His rise is described in the accounts of his role inside Aleph and the leadership succession. By 2017, he had begun referring to himself as a "second-generation guru," claiming a spiritual position that echoed his father's authority.
Voice recordings that surfaced in 2024 captured him declaring himself the new spiritual leader. Authorities subsequently confirmed that the recordings were authentic. The July 2025 announcement brought official recognition to a role that had developed over years, rather than identifying a sudden transfer of power.
Asahara had reportedly designated his second son as his successor after his own arrest in 1995. Tomoko Matsumoto helped advance that succession and continues to play a supporting role. Mother and son live together in Saitama Prefecture, where the agency is seeking fuller disclosure of activities at their residence.
The effort to install the son also met resistance inside the family and the movement. Asahara's third daughter opposed it, contributing to a split and the formation of the rival Yamada group in 2015. Despite that division, the son's leadership is now recognised by the authorities and Aleph's core membership.
The dates behind the succession
Aleph's present leadership grew out of a history stretching from Aum's founding to the prosecution of its senior members and the survival of successor organisations. The key dates show how the son's authority developed while the state continued its response to the original group's crimes.
- 1987: Chizuo Matsumoto, known as Shoko Asahara, founded Aum Shinrikyo, which began as a yoga and meditation group.
- March 20, 1995: Five Aum members released sarin on Tokyo's subway during the morning rush hour. Asahara was arrested later in 1995 and reportedly designated his second son as his successor after his arrest.
- 2000: Aum rebranded as Aleph, whose leaders initially acknowledged Asahara's role in the attacks and established a compensation programme.
- 2014: Asahara's second son was involved in organisational decisions and religious rituals by at least this year.
- 2015: Opposition to his succession contributed to a split and the creation of the Yamada group.
- 2017: The son began describing himself as a "second-generation guru."
- 2018: Asahara and 12 senior Aum members were executed after years of legal proceedings.
- 2024: Recordings emerged in which the son declared himself the new spiritual leader.
- April 2025: Saitama police found tens of millions of yen in cash at the family's home.
- July 2025: The PSIA identified the son as Aleph's de facto leader.
The timeline also places the family dispute before Asahara's execution. His son's involvement in leadership and the split over succession were already under way while the founder remained alive.
The violence Aleph inherited
Asahara built Aum Shinrikyo around a mixture of Buddhist, Hindu and apocalyptic Christian teachings. His predictions of approaching disaster and claims of supernatural powers attracted thousands of followers, including highly educated scientists and engineers. What began as a movement centred on yoga and meditation became a doomsday cult capable of producing chemical weapons.
On March 20, 1995, five members released sarin, a nerve gas, on Tokyo's subway during rush hour. The attack killed 13 people, with some accounts putting the death toll at 14, and injured more than 5,000. It became one of the worst acts of domestic terrorism in Japan's history.
The investigation exposed violence extending beyond the subway attack, including the murder of critics and defectors. Authorities arrested Asahara and hundreds of followers. The government seized the cult's assets, and Aum Shinrikyo was officially disbanded. Asahara and 12 senior members were eventually executed in 2018 after lengthy court proceedings.
The organisation's dismantling left behind followers, teachings and organisational networks. Several successor groups emerged, with Aleph becoming the most prominent. Those surviving networks explain why the authorities continue to monitor a movement whose founder and senior figures have been executed.
A new name and a younger membership
Aleph initially tried to put distance between itself and Asahara's crimes after adopting its new name in 2000. Its leaders acknowledged his role in the attacks, established a programme to compensate victims and sought to present a more moderate public image.
Continued reverence for Asahara and secrecy surrounding the organisation kept it under close government surveillance. The succession of his son now places the founder's family at the centre of the group, despite its earlier attempts to separate its public identity from his crimes.
The PSIA says more than half of Aleph's new recruits over the past decade were in their 20s or younger. Many were born after the 1995 attack and have little direct memory of the violence that made Aum Shinrikyo notorious. With about 1,190 followers and approximately 20 facilities in 2025, Aleph retains both a membership base and places to organise.
Recruitment methods have also changed. Aleph often conceals its identity when approaching potential members and uses conspiracy theories to attract younger people. Social media and other modern communication tools allow the group to reach recruits while making its activities harder for the authorities to monitor and counter.
Why people continue to join
Aleph's appeal includes the promise of purpose and belonging to people who feel alienated or dissatisfied with mainstream society. Like other new religious movements, it can offer a community and an explanation of the world to someone looking for direction.
Asahara's continuing status within the movement provides another focus for devotion. His son's emergence as a new guru gives followers a figure around whom to organise their loyalty and identity. The succession connects the founder's legacy with a living leader.
Secrecy and selective recruitment can add an attraction of their own, giving participation a sense of mystery and exclusivity. Aleph's use of social media and conspiracy theories adapts those methods to a generation with little personal memory of the subway attack.
The combination helps explain the group's persistence despite public knowledge of Aum's crimes and repeated government restrictions. Charismatic authority and a tightly connected community can keep an ideology alive even after the original organisation has been broken up.
What the government is restricting
Japanese authorities have repeatedly restricted Aleph's use of facilities and acceptance of donations under legislation aimed at organisations responsible for indiscriminate mass murder. These measures target the places and resources that allow the group to operate.
The PSIA has sought to extend and expand those controls, including prohibitions on acquiring or leasing new facilities in multiple prefectures. It has also demanded full disclosure of the purposes and activities of the Saitama residence occupied by Asahara's widow and son.
Designating the residence as an Aleph facility brings the family's home into the agency's scrutiny of the organisation. The official identification of the son as its effective leader also sharpens attention on where decisions are made and how the group is run.
Japan introduced new laws to monitor and restrict organisations linked to mass violence after Aum's crimes. The PSIA has carried out hundreds of inspections of groups connected to Aum, and the government continues to adjust its surveillance and intervention measures. Its task includes protecting the public while respecting civil liberties.
Hidden cash and unpaid compensation
Saitama police found tens of millions of yen in cash hidden at the family residence in April 2025. The discovery increased concern about Aleph's financial practices and possible concealment of assets while victims continue to wait for compensation.
A Supreme Court order requires Aleph to pay more than 1 billion yen to victims of Aum's crimes. The group has failed to make the required payment despite repeated court orders and government hearings, drawing accusations of malicious asset concealment and insincere treatment of victims' families.
Aleph's reported assets have fallen from about 1.3 billion yen in 2019 to about 40 million yen in recent reports, following restrictions on its financial activities and use of facilities. That is a reported decline of roughly 1.26 billion yen, or about 97 percent. For families awaiting payment, the amount Aleph declares and the resources investigators can locate are central to recovering compensation.
The group has also conducted businesses for profit under various names, complicating efforts to track and seize its resources. The cash found at the residence has added to the scrutiny of those arrangements. As of July 26, 2025, no date for payment of the outstanding compensation had been given.
Survivors fear a revival
Shizue Takahashi, whose husband was killed in the 1995 subway attack, has voiced concern that Asahara's son could rebuild the movement around the same concentrated authority. Her warning about a possible Aum revival focused on what might happen if he gained power comparable to his father's.
If he becomes as powerful within the cult as his father was, I believe he will try to expand it and create a new version of Aum Shinrikyo.
Takahashi's concern reflects the continuing distress of survivors and bereaved families. Many are still waiting for compensation, while recruitment and devotion to Asahara keep fears of renewed violence alive.
Security precautions continued after the 2018 executions. Authorities heightened protection around properties associated with Aleph and other successor groups. Yoko Kamikawa, the justice minister who approved the executions, was assigned lifetime protection because of concern about possible retaliation by cult members.
The son's identification as Aleph's leader brings together several issues that have persisted since the attack: the founder's continuing religious authority, the recruitment of younger followers, the difficulty of tracing money and the unfinished compensation process. For the people harmed by Aum, those are immediate concerns about security and justice.
Key Points
- The PSIA identified Asahara's unnamed second son, aged 31, as Aleph's de facto leader in July 2025.
- He has directed the group for nearly a decade with support from his mother, Tomoko Matsumoto.
- Aleph is believed to have about 1,190 followers and approximately 20 facilities across Japan.
- More than half of its new recruits over the past decade were in their 20s or younger, according to the PSIA.
- Authorities are seeking wider restrictions on facilities and fuller disclosure of activities at the family's Saitama residence.
- Police found tens of millions of yen in cash at the residence in April 2025, while compensation exceeding 1 billion yen remains unpaid.
- Survivors and bereaved families continue to seek compensation and express concern about a revival of Aum's ideology.
