Question: What unfinished German novel comes in three volumes and is considered the most influential modernist novel?

Context articles: List of Jiraishin chapters
Robert Musil
Achaja
History of Rome (Mommsen)
Matthias Lexer
Coriolanus (Brecht)
The Man Without Qualities
Der tote Preuße
1Q84
And Quiet Flows the Don

The manga series Jiraishin (地雷震 , lit.
 "Earth-Lightning-Quake") was first serialized in Afternoon and compiled into 19 volumes published by Kodansha, which started from October 23, 1993 to January 21, 2000 with the first three volumes sold for 509 Yen before the rest were sold for 530 Yen.
 Reprints came with 10 volumes in bunkoban from May 9, 2003 to September 12, 2003 for 798 Yen with another reprint in aizoban from February 23, 2009 to November 20, 2009 for 1,000 Yen.
 The North American version of the manga, retitled "Ice Blade", was serialized in Tokyopop's "MixxZine", but it was discontinued after three volumes.
 For France and French-speaking countries/territories, Génération Comics was the publisher before it was taken over by Panini Comics.
 For Italy, Stars Comics published all 19 volumes.
 In Germany and German-speaking countries and territories, Carlsen Comics was the publisher.
 In South Korea, Samyang Comics published Jiraishin in its entirety.
 In Taiwan, it was published by Tong Li Comics under the Youth Comic series label.
Robert Musil (] or [ˈmuːsɪl] ; 6 November 1880 – 15 April 1942) was an Austrian philosophical writer.
 His unfinished novel "The Man Without Qualities" (German: "Der Mann ohne Eigenschaften" ) is generally considered to be one of the most important and influential modernist novels.
Achaia is a Polish fantasy series of novels written by Andrzej Ziemiański, published in three volumes in 2002, 2003 and 2004 by the Fabryka Słów.
 The first two volumes received the Janusz A. Zajdel Award nomination (in 2002 and 2003, respectively); the second one received the Nautilus Award in 2004.
 All three volumes were reissued in 2011.
The History of Rome (German: "Römische Geschichte" ) is a multi-volume history of ancient Rome written by Theodor Mommsen (1817–1903).
 Originally published by Reimer & Hirsel, Leipzig, as three volumes during 1854–1856, the work dealt with the Roman Republic.
 A subsequent book was issued which concerned the provinces of the Roman Empire.
 Recently published was a further book on the Empire, reconstructed from lecture notes.
 The initial three volumes won widespread acclaim upon publication; indeed, "The "Roman History" made Mommsen famous in a day."
 Still read and qualifiedly cited, it is the prolific Mommsen's most well-known work.
 The work was specifically cited when Mommsen was awarded the Nobel Prize.
Matthias Lexer (18 October 1830 – 16 April 1892), later Matthias von Lexer (from 1885), was a German lexicographer, author of the principal dictionary of the Middle High German language, "Mittelhochdeutsches Handwörterbuch von Matthias Lexer", completed in 1878 in three volumes.
 This dictionary was founded upon the base of the "Mittelhochdeutsches Wörterbuch" by Benecke, Müller and Zarncke, completed in 1866 in three volumes.
Coriolanus is an unfinished German adaptation by the modernist playwright Bertolt Brecht of the English 17th-century tragedy by William Shakespeare.
 Brecht wrote it sometime between 1951 and 1953.
 This adaptation reveals the influence of Mao Tse-tung on Brecht's social thought especially the idea of primary and secondary contradictions which Mao discussed in his treatise On Contradiction.
 Brecht alluded to this text and discusses his development on the original and his ideas for its staging in an essay entitled "Study of the First Scene of Shakespeare's "Coriolanus"", which is written in the form of a dialogue with his collaborators at the Berliner Ensemble theatre company.
 The play was first staged by Heinrich Koch at the Frankfurt Schauspielhaus theatre, where it opened on 22 September 1962.
 It was later staged by the Berliner Ensemble in September 1964.
 Ruth Berghaus became famous for her staging of the slaughter scenes in this production.
 The play was published in an English translation by Ralph Manheim in volume nine of Brecht's "Collected Plays".
The Man Without Qualities (1930–43; German: "Der Mann ohne Eigenschaften") is an unfinished modernist novel in three volumes and various drafts, by the late Austrian writer Robert Musil.
 It is typically considered to be one of the most significant European novels of the twentieth century.
Der tote Preuße ("the dead Prussian") is an unfinished novel by the German writer Ernst von Salomon, published posthumously in 1973.
 It has the subtitle "Roman einer Staatsidee" ("novel of a state idea").
 The novel was supposed to be in three volumes and explain the concept of Prussia through an epic narrative.
 Salomon described the project as his "chief work"; however, he only wrote the first volume, which does not go beyond medieval times, and it was published in its unedited manuscript form.
 The book has a preface by Hans Lipinsky-Gottersdorf.
1Q84 (いちきゅうはちよん , Ichi-Kyū-Hachi-Yon , One Q Eighty-Four or Q-teen Eighty-Four or ichi-kew-hachi-yon) is a dystopian novel written by Japanese writer Haruki Murakami, first published in three volumes in Japan in 2009–10.
 The novel quickly became a sensation, with its first printing selling out the day it was released, and reaching sales of one million within a month.
 The English-language edition of all three volumes, with the first two volumes translated by Jay Rubin and the third by Philip Gabriel, was released in North America and the United Kingdom on October 25, 2011.
 An excerpt from the novel, "Town of Cats", appeared in the September 5, 2011 issue of "The New Yorker" magazine.
 The first chapter of "1Q84" had also been read as an excerpt in the Selected Shorts series at Symphony Space in New York.
And Quiet Flows the Don or Quietly Flows the Don (Тихий Дон, literally "Quiet Don") is an epic novel in four volumes by Russian writer Mikhail Aleksandrovich Sholokhov.
 The first three volumes were written from 1925 to 1932 and published in the Soviet magazine "Oktyabr" in 1928–1932, and the fourth volume was finished in 1940.
 The English translation of the first three volumes appeared under this title in 1934.