One day, Stelle, the Trailblazer and the Aeon of Finality, happened to find a button in her room that could let her transmigrate between worlds. And then...
Fate/stay night: I punch the students at school and kick the Heroic Spirits from history. Call me Akivili Stelle, God of Trailblazing.
The Divine Realm of the Round Table: What, your Holy Lance is blooming? My Flame Lance will protect us.
The Final Singularity: Goetia: Behold, I banish your Heroic Spirits!
Stelle: Sorry, Haki-Goetia, but I'm no Heroic Spirit. Behold, my Flame Lance charge!
Jujutsu Kaisen: And now, taking the field against Sukuna, from the Astral Express, the Trailblazer of the Honkai: Star Rail universe, the Aeon of Finality, the Aeon of Trailblazing, Stelle!
...Coming up: Hero Execution, No Game No Life, Magic Eye Collection Train, Jujutsu Kaisen, Grand Order: Prologue, and Miss Kobayashi's Dragon Maid, in no particular order.