History Manga / ShimejiSimulation

* ParentalAbandonment: Shijima and her sister's parents. No one knows what happened to them or where they have been. The flashback scene on Chapter 30 showed a part where Big Sis mentioned how they both "don't even have parents". [[SubvertedTrope Subverted]] in Chapter 45 when it was revealed that both of them are created by the simulation and are {{Artifiical Human}}s.

* SpoiledByTheManual: Each of the ".5" chapters, the character manuals, are blatant spoilers on its own. For instance, officer Mogawa's relation to teacher Mogawa as her younger sister was blatantly shown in Chapter 30.5. But the character in question only appeared as an EarlyBirdCameo in Chapter 28 who was mistaken for teacher Mogawa. Officer Mogawa's relation to teacher Mogawa as her younger sister was revealed in Chapter 30.5, spoiling this fact, since their relationship as siblings was not revealed until Chapter 35.

** Additionally, in Chapter 40 an even more extreme change happens because of Sis's conflict with her duplicate.

* ParentalAbandonment: Shijima and her sister's parents. No one knows what happened to them or where they have been. The flashback scene on Chapter 30 showed a part where Big Sis mentioned how they both "don't even have parents". [[SubvertedTrope Subverted]] in Chapter 45 when it was revealed that both of them are created by the simulation.

* NothingIsTheSameAnymore: After the battle, West Yomogi has been radically changed, as a result of the conflict between Sis and the Gardener. Additionally, in Chapter 40 an even more extreme change happens because of Sis's conflict with her duplicate.

** The Oneshot showed a lesbian romance between Mina and Yocchan, including a [[BleachedUnderpants risqué sex scene]] between the both of them. It was until Yocchan tragically committed suicide at night, causing Mina to be a recluse.

* {{Cyberspace}}: While TheReveal in Chapter 30 shows that the world that Shijima and Majime in is a simulation, Chapter 44 shows that not only the entire world they live in is, in fact, a simulated reality, but it also unveils another revelation from Yomikawa's hypothesis that the reality they are in is within a computer no larger than Shijima herself.

** Volume 5's cover art shows Shijima and Majime with each other. It's a very major spoiler to boot as it did not happen until the very last chapter where both have reunited again.

** Volume 5's cover art shows Shijima and Majime reuniting with each other, which blatantly spoils the manga's ending that they indeed reunited after a millennia of long-distance separation.

* LongDistanceRelationship: Non-romantic version. After Shijima goes back in time to fix the damage that the Big Sis Clone caused, as mentioned by Sis, Shijima had to distance herself from the people she knows including her OnlyFriend Majime as well as the rest of the people she knew. It was the main thing that she and her sister had done to stop people from merging to one another and reversing the inevitable collapse, but at the adverse effect of not seeing Majime and many other people she knew closely ever again. This is subverted in Chapter 48 when Shijima arrives in a familiar-looking planet where it is revealed to be Majime's world.

An official voiced narration of the manga's first chapter was released from Kadokawa's official [=YouTube=] channel, with cast featuring Creator/NaomiOzora, Creator/YumiriHanamori, and Creator/MaiFuchigami as Shijima, Majime, and Sis, respectively. Time will tell if an anime adaptation will ever happen.

[[https://twitter.com/shojoshumatsu/status/1694394402465357850 On August 23, 2023, it was confirmed the manga would be ending, though an exact date was not given.]] The following month via the end of the penultimate chapter, it was announced that it would end that November. The manga ended with Chapter 49 on November 27, while the final volume is set to release on January 26, 2024, exactly five years after the manga's debut.

** In terms of characters, they are also different, in spite of being in the same black-and-blonde-haired {{Foil}} duo lead mold. Chito is an orphan who was taken care of by her surrogate parental figure only known as Grandfather; Shijima is an ArtificialHuman since she was created by the simulation and only has Big Sis as her surrogate parent. Yuuri, like Chito, is an orphan who is a complete ditz; Majime lives with both her parents in a stable household. Big Sis is seen as a contrast to Ishii, who are both scientists, are TheStoic and are {{Wrench Wench}}es with an affinity for engineering. Ishii is a NiceGirl who is helpful to the protagonists, such as fixing Chito and Yuuri's Kettenkrad, but her learnings are rooted to the past. Big Sis is an AloofDarkHairedGirl who often focuses on her experiments more than taking her younger sister and is also morally ambiguous who is willing to commit such acts to achieve it; plus she leans to the futuristic aspect of her learnings.

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* {{Bookends}}: Chapter 1 starts with Shijima encountering Majime for the first time after her reclusion within her own school. Chapter 49 ends with the former reuniting with the latter who also left after secluding herself from her own world in the same location.

* LivingToys: Every single people in the world that Majime created is based on her own toys, namely plushies. Majime gives them humanlike traits, causing them to develop human sentience, making them completely indistinguishable to a regular living toy. Eventually they multiply as many years have passed, making her own world a fully populated planet.

* {{Bookends}}: Chapter 1 starts with Shijima encountering Majime for the first time after her reclusion. Chapter 49 ends with the former reuniting with the latter who also left after secluding herself from her own world.

** Yoshika, Shijima's pencil case, is later used in the Dream World by Majime, albeit a larger version of it, which was ridden by her, when she fights off against the giant crab within one of the Dream Danchis, thus saving Shijima from the jaws of death.

* DenouementEpisode: Chapter 48 is the penultimate chapter of the manga, where many, if not all of the manga's loose ends have been dealt with, primarily including the simulation's connection to the past of ''Girls' Last Tour'''s history and the mystery surrounding Majime's disappearance for millennia. It ends with a WhamShot {{Cliffhanger}} where Shijima arrives at Majime's world through the train she rode throughout the chapter, complete with very familiar scenes: the large watermelon structures and [[TalkingAnimal talking rabbits]] that are revealing to be the members of Chiho tribe, ultimately setting up the GrandFinale of the manga as Shijima begins to achieve her one final goal: to reunite with Majime. Chapter 49, the GrandFinale, starts with Shijima arriving in Majime's world within the Chiho Tribe Kingdom, looking for her, before she finally reunites with her at the end of the chapter after one thousand years have passed.

* DenouementEpisode: Chapter 48 is the penultimate chapter of the manga, where many, if not all of the manga's loose ends have been dealt with, primarily including the simulation's connection to the past of ''Girls' Last Tour'''s history and the mystery surrounding Majime's disappearance for millennia. It ends with a WhamShot {{Cliffhanger}} where Shijima arrives at Majime's world through the train she rode throughout the chapter, complete with very familiar scenes: the large watermelon structures and [[TalkingAnimal talking rabbits]] that are revealing to be the members of Chiho tribe, ultimately setting up the GrandFinale of the manga as Shijima begins to achieve her one final goal: to (hopefully) reunite with Majime.

[[https://twitter.com/shojoshumatsu/status/1694394402465357850 On August 23, 2023, it was confirmed the manga would be ending, though an exact date was not given.]] The following month via the end of the penultimate chapter, it was announced that it would end that November. The manga ended on November 27.

''Shimeji Simulation'' is a {{seinen}} slice-of-life four-panel comedy manga, which is written and illustrated by Creator/{{Tsukumizu}}, the same author behind ''Manga/GirlsLastTour'' (2014-2018). It was published by Media Factory and serialized by ''Magazine/ComicCune'' from January 26th, 2019 to November 27, 2023.

''Shimeji Simulation'' is a {{seinen}} slice-of-life four-panel comedy manga, which is written and illustrated by Creator/{{Tsukumizu}}, the same author behind ''Manga/GirlsLastTour'' (2014-2018). It is published by Media Factory and has been serialized by ''Magazine/ComicCune'' since January 26th, 2019.

[[https://twitter.com/shojoshumatsu/status/1694394402465357850 On August 23, 2023, it was confirmed the manga would be ending, though an exact date was not given.]] The following month via the end of the penultimate chapter, it was announced that it would end that November. The manga ended on November 27, 2023.

[[https://twitter.com/shojoshumatsu/status/1694394402465357850 On August 23, 2023, it was confirmed the manga would be ending, though an exact date was not given.]] The following month via the end of the penultimate chapter, it was announced that it would end that November.

** It is also the first of the author's works to write it in {{Yonkoma}}, short-story format with chapters averaging 10 to 11 pages total, in contrast to his previous work where it would take 20 to 30 pages on each chapter. However, Chapter 48 breaks this trend by itself as it had 19 pages total instead of the usual 10 or 11.

* BaitAndSwitch: The dream sequence seen in Chapter 47 gives off the impression that everything goes back to normal and with Shijima reuniting with her old friends. Until it is revealed that it is just another of her dreams.

Adding to the strangeness of all things is when Shijima encounters another girl, Majime Yamashita, ThePollyanna who is within Shijima's class, who happens to have a half-fried egg sitting on top of her head.