SEGA said on 30 October 2026 that the emergency maintenance on its smartphone RPG Chain Chronicle (チェインクロニクル), offline since 23 October, is likely to last one to two months, because fixing the affected systems may require a large-scale overhaul of the whole app. The update was added at 15:00 JST to the game’s official maintenance notice.
The game went down at about 17:00 JST on 23 October. The original notice cited security vulnerability problems affecting internet services and said SEGA was checking the app and its servers; it did not name a specific vulnerability. In the latest update, SEGA says it has confirmed problems in some systems and that updating those systems alone may not be enough. It expects the investigation to take about a month, with a similar period for the work that follows, and warns that the schedule may change. No unauthorised access or information leak has been confirmed. A 26 October addendum promised compensation, to be detailed later, for events, login bonuses and Royalty Plan daily rewards that expired during the outage. The developers will explain the situation on episode 492 of the official radio show Chenradi on 2 November.
Chain Chronicle launched in July 2013 and is now in its fifth story part, added in 2025. It has more than 1,800 characters and over 30 million characters of scenario text, AUTOMATON reports. AUTOMATON set the outage against the critical PHP flaws fixed on 21 October, which sent many Japanese games into emergency maintenance. As GameTales reported, SEGA’s own product information site was offline for PHP fixes from 21 to 23 October, most affected services returned within about two days, and two long-running games closed rather than migrate. Cygames needed eight days and an upgrade across several PHP versions to bring back its 2011 card RPG Shingeki no Bahamut. SEGA has not said whether Chain Chronicle‘s problem is connected to PHP.