The story follows the adventures of twin brothers, Leon and Lex fou Bartfort, who are reincarnated into a harsh, female-dominated fantasy world based on an Otome Game that Leon's sister forced him to play in his previous life. They possess unique, celestial powers, the "Graces" of Storm and Eclipse, which operate outside the norm of the world's magic system.
Part 1: Reincarnation and Worldbuilding
Setting: The Kingdom of Holfort, a place where continents float as islands and women hold societal power, while men are often relegated to secondary roles or soldiers.
Protagonists:
Leon: The elder twin, possessing the Storm Grace (wind, water, sound, lightning manipulation). He is pragmatic, strategic, and aware of the world's status as a game.
Lex: The younger twin, possessing the Eclipse Grace (sun/fire/light by day, moon/ice/shadow by night). He is more outwardly enthusiastic and embodies a "warrior's spirit."
The Conflict: The world is constantly under attack from "monsters of darkness," countered by "creatures of the light" who use Graces (both natural and artificial) to fuel their magic and giant mechanized suits/battleships.
The Problem: The Bartfort family is a poor barony. Their stepmother, Zola, constantly schemes to secure the family's finances by manipulating the twin's future.
Part 2: Military Training Arc
At age five, the twins are enrolled in a five-year military training camp on an island base.
Training Staff: They are trained by the "Howling Commandos," led by hardened instructors Sergeant James Buchanan Barnes (Bucky) and Captain Steve Rogers, who become surrogate mentors.
Skill Development: The twins hone their military tactics, physical strength, and control over their nascent Rank C Graces. They form a lasting bond with fellow cadets Daniel and Raymond.
Graduation and Anomaly: During their final mock battles, Leon wins his match. Lex loses but manifests an uncontrollable, immensely powerful "Avatar of the Sun" form, hinting that their powers are S-Rank or EX-Rank and linked to a celestial destiny.
Return Home: The twins graduate as C-Rank Privates and immediately return home, where they defend their barony from a surprise attack by massive "Behemoth" monsters, proving their strength to their family.
Part 3: The Adventure and Acquisition of Power
Years later, at age 12, Zola attempts to force the twins into disadvantageous marriages with older Countesses to clear family debt.
The Escape: Remembering the game's lore, Leon convinces Lex to seek a "cheat item" hidden in a remote dungeon. They acquire sanction from Captain Rogers to leave for a four-year adventure.
The AIs: Six months into their journey, they find two advanced AI units in a ruin: Luxion (for Leon) and Jarvis (for Lex). These AIs confirm the world's magic system is a flawed, artificial one and provide essential tactical support.
Power Ups: With AI assistance, the twins conquer multiple dungeons, rapidly advancing their Graces to Rank B (on the cusp of A-Rank) and acquiring vast wealth and resources.
The Islands: They discover and claim three secret floating islands, establishing a personal automated farm, shipyard, and resort.
Return and Triumph: Four years later, they return home, rich, powerful, and independent. They have already transferred funds and enrolled in the Academy, successfully circumventing Zola's scheme and securing their future on their own terms.