In a world where "Shine Arts" and "Machinery" stand side-by-side, a girl challenges her destiny.

This is a story of a girl's love and adventure, a girl destined to save the world.

[Early Stages - Chapter 1~]

Luce, a girl living in a city in the southern part of the kingdom.

Leading an ordinary life as a student, she experiences her first love after meeting Just, a young Shine Knight apprentice.

One day, when threatened by a demon beast, Luce performs a "Subjugation Contract," following the example of a hero from legend.

This awakens her hidden Shine Arts talent.

However, this also brings about a cruel fate: Just is exiled from the country.

—I want to see him again.

With that wish in her heart, Luce leaves her hometown and embarks on a journey into an unknown world.

(Minor spoilers ahead!)

[Mid-Stages - Chapter 4~]

After training under a Great Sage, Luce finally becomes a full-fledged Shine Arts practitioner.

However, what awaited her was the shadow of an impending war.

To prevent the outbreak of war, Luce heads for the Holy City at the far western end of the land.

Joining her on her journey are—

a young Shine Knight apprentice, a swordsman from an eastern kingdom, a prince from a small country, a village girl, and a young vampire girl.

Through repeated encounters and partings, and battles against formidable foes, Luce grows steadily.

Eventually, she comes to be known by the people as the reincarnation of the "Blazing Shine Arts Master."

[Final Stages - Chapter 9~]

The elite of humanity were defeated by the Demon Lord.

Invaders appear from the Dark Otherworld, plunging the world into despair.

At that moment, Luce awakens from her slumber—and awakens to the "Demon Lord's power."

Wielding overwhelming power, she defeats one evil enemy after another.

Meanwhile, at that time.

Invernata, a friend from Luce's hometown, is transported to a completely different world due to an accident.

There, she witnesses a third world with advanced mechanical civilization.

Eventually, the forces of that world intervene in the conflict, and the gears of fate begin to turn dramatically—.