PC version of "Crusader Kings III" officially supports Japanese language; East Asia expansion DLC "All Under Heaven," featuring Japan, also released

Note: the original Japanese article can be found at:
https://www.4gamer.net/games/482/G048283/20251029030/

Editorial Department: Oritaka | 2025/10/29 05:39 (UTC)

Paradox Interactive today (October 29, 2025) released update 1.18.0 “Crane” for the PC version of Crusader Kings III, including official Japanese language support, and simultaneously launched a new expansion DLC titled “All Under Heaven,” set in East Asia.

The price is 3,990 yen (tax included) on Steam and 3,500 yen (tax included) on the Microsoft Store. On Steam, the base game is currently discounted by 70%—down to 2,097 yen (tax included)—until November 7.

The image in this article is from the Steam store page (external link) Thumbnail for Image Gallery No.002 / PC version of “Crusader Kings III” now officially supports Japanese; new East Asia expansion DLC “All Under Heaven,” featuring Japan, is released

The new expansion, All Under Heaven, is positioned as the largest DLC in this series to date. Set in East Asia, it includes Southeast Asia and features Japan for the first time.

PC Interview

Interview: Why Did the Latest DLC “All Under Heaven” Cover East Asia? Developers Explain

The Crusader Kings series has long been a core favorite among Paradox Interactive’s historical grand strategy games, yet Japan had never appeared on the map in previous installments. However, with the latest DLC for Crusader Kings III, titled “All Under Heaven,” players can now actually play as Japan—so why was this change made? We asked the developers.

[October 11, 2025, 12:00]

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Additionally, update 1.18.0 “Crane” has officially added Japanese language support. Previously, players needed to rely on fan-made mods to play in Japanese—this official localization also drew from the efforts of volunteer contributors.

In their announcement, Paradox Interactive expressed special gratitude to five individuals who helped improve the Japanese version. These five were also involved as beta testers for All Under Heaven:

FUN: Creator of the “Shogunate” mod
awak: Creator of the “Japanese Improvement (Emergency)” mod
kirakee: Volunteer translator and video creator for a fan-made Japanese localization mod
Tsukuda: Participant in the CK2 Medieval Japan History mod, “NMIH”
Shikan: Volunteer translator for a fan-made Japanese localization mod

PC Play Report

Introducing the Appeal of “Crusader Kings III,” Now Even More Enjoyable for Roleplay

Crusader Kings III, released on September 2, 2020, is the latest installment in a series beloved by strategy fans. Known for its balanced difficulty and engaging gameplay, it features an extensive tutorial system that makes it accessible even to newcomers. This article explores the appeal of CK3 through firsthand play reports.

[December 29, 2020, 00:30]

As a beta tester, I created a mod to improve the official Japanese version of #CK3 (approximately 20,000 corrections). In preparation for official improvements, I’m releasing this as an emergency measure. Please feel free to use it. https://t.co/BfDXn9Dpxz

— awak (@awak1180) October 28, 2025

4gamer english

PC version of "Crusader Kings III" officially supports Japanese language; East Asia expansion DLC "All Under Heaven," featuring Japan, also released

Interview: Why Did the Latest DLC “All Under Heaven” Cover East Asia? Developers Explain

Introducing the Appeal of “Crusader Kings III,” Now Even More Enjoyable for Roleplay

Official Website for “Crusader Kings III”

Steam Workshop: Shogunate (Japanese version) for “Crusader Kings III”

Steam Workshop: Japanese Improvement (Emergency) for “Crusader Kings III”