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Developer Project Moon announced on October 27 that Library of Ruina has been certified by Guinness World Records for the "longest campaign/story in a video game," with a certified play time of about 113 hours; the announcement says the certification happened in June. That is 12 hours more than the previous record holder, Persona 5 The Royal.
The Guinness record counts main campaign clear time, but the method and source are not stated. AUTOMATON points out the figures match HowLongToBeat's "Main Story" entries (113 hours for Library of Ruina, 101 for Persona 5 The Royal), and adds that some idle and simulation games on that site have far longer "Main Story" times, so the record does not necessarily mean it beat every game's clear time.
Library of Ruina is a high-difficulty battle game that shares a world with Project Moon's earlier Lobotomy Corporation, on PC (Steam), Switch, PS4, Xbox Series X|S and Xbox One with Japanese language support. Only invitation holders can visit the library, and guests who lose there become books. The hero, Roland, wanders in without an invitation and, on the condition that he helps the librarian Angela get "one perfect book," works there as a librarian. Battles use dice and cards called "pages," and enemies and allies follow the same basic rules. At the time of writing it had a "Very Positive" Steam rating, 94 percent positive across about 41,000 reviews. Lobotomy Corporation shows 58.5 hours on HowLongToBeat, and Project Moon's free-to-play Limbus Company is still being updated.
The insider take
A record like this is mostly a good reason for people to talk about the game, and with the fine print above in mind it is best read as a fun milestone rather than a definitive ranking.
Originally reported by AUTOMATON (Japanese).