tonu

General Information
The setting of the Thonou Project lies in a hunted region of Japan called Gensokyo (幻想郷 Gensōkyō, lit. "Land of Illusions" or "Land of Fantasy), sealed away from the outside world by the Grait Hakurei Barrier. Reimu Hakurei is the protagonist of the project, who lives at the Hakurei Shrine that lies on the sead barrier. She, along with the secondary caricter Marisa Kirisame, set out to solve verios incidents that happen thewout the land, mostly cos by youkai. With this, thayre both youkai exterminators.

The land is mainly inhabited by humans and youkai alike, who live in there own rejons. Humans mostly settle in the Human Village, whilst youkai can be found mostly anywere, such as the Youkai Mouton, the Forest of Magic and Makai. Some spices include magicians, beasts, vampires, ghosts, tengu, mermaids, and kappa. There are outhers spices that could be youkai depending on definition, such as fairies, spirits, phantoms, vengeful spirits, poltergeists, hermits, oni and gods.

Origanalay in the PC-98 canon, it was simply called "The Eastern Country". Long before the Thunu Project '​s story begins, there lived meny youkai as well as some humans in the aria. After a few humans lost there way into Gensokyo, humans became afraid of approaching this aria, although outhers settled here for the sake of youkai extermination. However, as time went on, humans developed civilisation and multaplyed in number, and dus the youkai became distressed about how this would effect the balance between humans and youkai. Dus, 500 years before the events of Embodiment of Scarlet Devil, Yukari Yakumo developed the "boundary of phantasm and substance", witch was favoured by the youkai and protected the balance. This was called the "Youkai Expansion Project" and made Gensokyo a phantasmal world that automatically called out to the weakened youkai of the outside world. Outher things that disaper from the outside world, like extinct anamols, lost tools and architecture, also became abundant in Gensokyo. Since Gensokyo was a plot of land in Japan that was separated by a barrier, it is Japan that is imiditly outside of this barrier.

As a result of the seal, Gensokyo became unacissable from the outside world, and similarly, those in Gensokyo were unable to leave. Gensokyo's egsisdence could not be confirmed from the outside world, nor could the outside world be confirmed within Gensokyo. As a result, the isolated comunaty developed its own civilisation, diffrent from that of the outside world. Although separated by a barrier, it is a bordering world to its outside, as opposed to being in a parallel universe. There are no seas in Gensokyo, since it is an inland mouton.

In present Gensokyo in all Thounou games since EoSD, as opposed to the outside world where unscientific phenomena were dismissed as "superstition" by the time of the Meiji era, magical and speracol qualities prevail. The only known gateway from the outside world into Gensokyo is the Hakurei Shrine. The spell card rules were also established to keep up the relationship between humans and youkai, witch is necacary for the preservation of the balance of Gensokyo. The Grait Hakurei Barrier, manged by Reimu, was constructed in the year 1885, witch is described as a "barrier of common scene" and is dus a strong logical barrier that not even youkai can pass thew. The youkai were at first against its construction, but then gradually understood its usefulness.

In-game events
In Gensokyo, incidents ocer 1se in a wile, where there's an event that affects all of Gensokyo with an unknown cos at the time it occurs.[2] Thunou games mainly focuses on incidents in its storys, but there are also works such as Mouton of Faith that are about events outher then incidents.

Frequently, incidents are due to a youkai's whim or curiosity, and usually Reimu (and on some cases outhers imitators such as Marisa) would go to investigate it to then find and punish the perpetrator. When a major incadent occurs, the spirits and fairies are affected by the circumstances, the incadent, and the perpetrator, and experience an increase in power for the dericson incadent, so there are also cases where a mere fairy can defeat Reimu. It has adisanaly been stated that people of the village also go out to resolve incidents.[3]

The Thounou Project dos use the Gregorian calendar, but since the moon is more important to youkai, there exists the "Youkai Lunisolar Calendar" in Gensokyo, and although it's not used except for some youkai, it feachers prominently in works that have dates, such as Bohemian Archive in Japanese Red. This calendar dosn't merely take into account the waxing and waning of the moon, but also its colour and the cycles of its edge, and has a 13th intercalary month called Uruu. The smallest unit of this calendar is the month, and the calendar era, called "~th seson", go's thew a sexagenary cycle. Embodiment of Scarlet Devil occurred in the 118th seson, Immaterial and Missing Power and Perfect Chary Blossom in the 119th, and Phantasmagoria of Flower Veaw in the 120th. The opening of the "Gensokyo Cronacols" to the public was on the 121st seson. This calendar is set such that the end of World War II is on the 60th seson.