Plot synopsis
Three Houses takes place on the continent of Fódlan. The landmass is divided into three rival nations who are now at peace: the Adrestian Empire to the south and west, the Holy Kingdom of Faerghus to the north, and the Leicester Alliance to the east. The Church of Seiros, based at Garreg Mach Monastery at the continent's center, is the region's dominant religion and is an influential power in Fódlan in its own right. In ancient history, a war raged between the Church's titular founder Seiros and the "King of Liberation" Nemesis, an era which also saw the establishment of the Empire by Seiros. In the thousand years since then, the Kingdom split away from the Empire, then the Alliance declared its independence from both powers. A prolonged conflict ensued, with the Church being responsible for keeping peace. The nobility of Fódlan frequently bear Crests, sigils passed down through families that grant magical powers. Bearing a crest greatly influences dynastic politics, with nobles inheriting Crests valued far above those who lack them. Those who have Crests can also wield powerful artifacts called Hero's Relics. The series's titular "Fire Emblem" appears as the "Crest of Flames", the Crest associated with the Progenitor God.
Players take on the role of the main character, called Byleth by default and who can be either male or female. A mercenary by trade, they become enrolled in the Officers Academy of Garreg Mach Monastery as a teacher. During their journey Byleth is aided by Sothis, a strange and initially-amnesiac girl who appears in their dreams and can only be heard by them. At Garreg Mach Monastery, Byleth chooses one of the three school houses, each aligned to a different nation of Fódlan. They are the Black Eagles led by Edelgard, imperial princess and heir to the Adrestian throne; the Blue Lions, commanded by Prince Dimitri of the Kingdom; and the Golden Deer led by Claude, heir to the Alliance's leading family. The Monastery's staff includes those who directly work for the Church, some of whom are recruitable by the player. Other characters include Jeralt, father of Byleth, and Rhea, archbishop of the Church.
One night, Byleth and Jeralt rescue three young nobles, Edelgard, Dimitri, and Claude from bandits, greatly impressing them. During the attack, Byleth is saved by the mysterious Sothis, who remains within them. Jeralt and Byleth are summoned to Garreg Mach Monastery, the home of the Church of Seiros, Fódlan's dominant religion. Jeralt reluctantly rejoins the Church's military arm, the Knights of Seiros, while Byleth is made a professor of the monastery's Officers Academy. Jeralt privately warns Byleth not to trust the Church's archbishop, Rhea. Byleth is then given the choice of leading one of the academy's three houses: the Black Eagles, the Blue Lions, or the Golden Deer, each populated by students from the Empire, Kingdom, and Alliance respectively. Byleth assumes their duties as teacher for their chosen house, training their students and leading them in battles on behalf of the Knights of Seiros. Byleth and their students discover frightening hints on the nature of Relics and Crests, such as a Relic thief transforming into a monster. Various conspiracies meddle with the monastery and plot against the Church: masked warriors called the Flame Emperor and the Death Knight, the Western branch of the Church, and a hostile cult known as "those who slither in the dark". Byleth thwarts an attempt to steal a powerful Hero's Relic, the Sword of the Creator. Unexpectedly, the Sword activates when Byleth holds it, and Rhea allows them to keep it.
Jeralt is later murdered by Kronya, an agent of "those who slither in the dark". Reading Jeralt's diary, Byleth discovers that Jeralt fled from the Church due to Rhea's plans for Byleth when they were born. The "Sothis" within Byleth is the original Progenitor God, implanted by Rhea into Byleth as a baby so that Sothis would be reborn. Byleth pursues the cultists responsible for Jeralt's death. A magical attack by one of their leaders forces Sothis to merge with Byleth, allowing them to survive and defeat the cult members with a newly empowered Sword of the Creator. Rhea makes a futile attempt to awaken Sothis within Byleth, but the Flame Emperor attacks the ceremony with allies from the Adrestian Empire. The Flame Emperor is revealed to be Edelgard, who like Byleth bears the Crest of Flames; she accuses the Church of being corrupt. If Byleth sides with Edelgard, they help her lead an assault on Garreg Mach. If they side with Rhea, Dimitri, or Claude, then they help in the defense of the monastery; Rhea is also revealed to be a dragon. Regardless of the side chosen, Byleth is knocked unconscious at the end of the battle and wakes up five years later, discovering that Fódlan has plunged into war as the Empire, Kingdom, Alliance, and Church battle each other. The routes then diverge.
If Byleth joined the Black Eagles and sides with Edelgard, they reunite with their students and find that the Kingdom has allied with the Church while the Alliance remains nominally neutral. Edelgard and Byleth attack and seize the Alliance capital and eliminate Claude from the war, either through killing or exiling him. They then advance into the Kingdom, taking a vital fortress. In retribution for Edelgard interfering with their schemes, "those who slither in the dark" arrange for the fortress to be destroyed. Edelgard keeps the truth a secret and tells the others that the fortress was destroyed by Church weaponry. Edelgard continues to lead her armies to the Kingdom's capital. Dimitri meets Edelgard in battle, but is defeated and killed. The Kingdom army is routed and Rhea withdraws to the Kingdom capital with her Knights. In her madness, Rhea sets fire to the city, forcing Edelgard to attack to put a stop to her. Byleth and Edelgard are able to kill Rhea. Byleth nearly dies, but Sothis's Crest Stone embedded in their heart dissolves, reviving them. In the aftermath, Edelgard unites all of Fódlan under the Empire and abolishes both the Church and the nobility.
If Byleth sides against Edelgard after joining the Black Eagles, a similar version of the Verdant Wind route plays out with Byleth allied with Church remnants and the Black Eagle students against the Empire. After defeating Edelgard in the Empire's capital and "those who slither in the dark" in Shambhala, Byleth learns the full truth of their origins from Rhea, and is then forced to defeat her after she is driven berserk due to wounds sustained in Shambhala. Fódlan is subsequently unified under the Church with Byleth as its new leader.
If Byleth joins the Golden Deer, they reunite with Claude and rally their students and the remnants of the Church to stand against the Empire. Gathering allies and support, Byleth and Claude invade the Empire. As they confront Emperor Edelgard and her forces, a Kingdom army led by Dimitri also arrives, resulting in a massive battle. Edelgard is forced to retreat while Dimitri is killed. Byleth and Claude press on towards a strategic Empire fort, and receive aid from the foreign nation of Alymra. Claude admits he secretly opened relations with Almyra, and announces his desire to open Fódlan's borders to the outside world and end the continent's isolationism. Byleth and Claude attack the Empire capital, where they defeat and kill Edelgard. Byleth and Claude learn "those who slither in the dark" have been manipulating both the current war and the original war a millennium before. Claude's army defeats the cult in their secret underground city Shambhala. Their leader attempts to destroy them with a rain of missiles, but Rhea intercepts the missiles in her dragon form. Meanwhile, Nemesis is awakened from his tomb by the cult; he and his Ten Elites were a band of thieves who took power from Sothis and her dragon kin after they were slain by the cult in the ancient era. This power was the source of the nobility's crests. Byleth and Claude destroy Nemesis and his undead army. In the aftermath, Fódlan is united under Byleth's rule as they and Claude open its borders and start relations with foreign nations.
If Byleth joins the Blue Lions, they reunite with Dimitri, who has been ousted from the Kingdom due to a coup from pro-Empire nobles. Dimitri has become bitter, disillusioned, and unstable as he is haunted by visions of his deceased family and driven to kill Edelgard at any cost. Byleth's students and the remnants of the Church ally with Dimitri despite his erratic behavior. Dimitri eventually forces a massive battle between his own army, the Empire, and the Alliance, resulting in heavy losses on all sides. One of Dimitri's trusted vassals sacrifices himself to protect him from an assassin, which combined with Byleth's guidance causes Dimitri to abandon his desire for revenge. After securing his own lands, Dimitri rescues Claude from imperial forces. Claude dissolves the Alliance and cedes its lands to Dimitri before departing Fódlan. Dimitri then marches for the Empire capital itself. Wanting to make peace with Edelgard, Dimitri arranges a meeting with her and suggest they join forces to realize their goals; Edelgard refuses. Dimitri is able to defeat Edelgard and once again offers her mercy, but is forced to kill her when she attempts to attack him. In the aftermath, Fódlan is united under the Kingdom with Dimitri as its ruler, while Byleth becomes the new archbishop of the Church when Rhea steps down.
In the Cindered Shadows DLC campaign, Byleth pursues an intruder into a hidden underground complex called Abyss, discovering a secret house called the Ashen Wolves; originally hidden through a secret truce, mercenaries have begun raiding Abyss. Byleth and the students agree to help defend Abyss. Aelfric, the Church's liaison to Abyss, warns Byleth that factions within the Church would like to see Abyss purged. Aelfric theorizes that the mercenaries are looking for the Chalice of Beginnings, a key object in a ritual attempted during Garreg Mach's early days with the aim of resurrecting Sothis. Aelfric is captured and ransomed for the Chalice, which Rhea reluctantly agrees to hand over believing the ritual lost. The Ashen Wolves also privately admit to Byleth that they are descendants of the four who performed the ritual, ordered by the Church to keep their bloodlines secret. Aelfric is revealed to be the mastermind, capturing the Ashen Wolves and preparing to use the Chalice to resurrect Byleth's mother Sitri, for whom he held a secret love. Byleth rescues the Ashen Wolves, and when he attempts the ritual anyway Aelfric is transformed into a monster and killed. The Ashen Wolves are disbanded and allowed to leave Garreg Mach, with the four members to return to help each other and Byleth if needed.
Characters from Three Houses were added as playable units in the mobile game Fire Emblem Heroes shortly after the game's release. A costume based on Three Houses was included in the Nintendo Switch port of Tokyo Mirage Sessions ♯FE. Byleth appears as a playable character in the 2018 crossover fighting game Super Smash Bros. Ultimate, being released as downloadable content on January 28, 2020. Both male and female versions of Byleth are present as alternate costumes for the fighter, whose attacks are based around the use of four of the game's weapons. The Byleth DLC also includes Garreg Mach Monastery as a new stage, as well as a selection of eleven music tracks from Three Houses. An Amiibo figure of Byleth was released on March 26, 2021. A Three Houses-inspired tea drinking minigame was included in the 2021 video game WarioWare: Get It Together! for Nintendo Switch.
In February 2022, during a Nintendo Direct presentation, Nintendo announced a spin-off of Three Houses for the Nintendo Switch entitled Fire Emblem Warriors: Three Hopes, a hack and slash game in the style of Koei Tecmo's Dynasty Warriors series and a successor to 2017's Fire Emblem Warriors, which was released on June 24, 2022. It is set in the same universe as Fire Emblem: Three Houses along with the same cast of characters, but features an alternative story where Byleth does not come to teach at the monastery, along with a completely new protagonist and scenarios.
