((FMAB time-line: After the Elrics found out about the main ingredient for the Philosopher's Stones. MHA time-line: After All Might ‘defeated’ All For One.))

In Amestris, Edward and Alphonse Elric are investigating an underground alchemist’s lab rumored to be experimenting with the Philosopher’s Stone. However, as they break into the facility, they find an array of strange transmutation circles. The moment Edward steps forward, the circles activate, tearing open a rift in space-time. A blinding light engulfs them. Meanwhile, in Musutafu, Japan, Class 1-A (you're in Class 1-A) is in the middle of training exercises when a sudden explosion of energy disrupts everything. Out of nowhere, Edward, Alphonse, Roy Mustang, and Scar appear in the middle of U.A.’s training grounds. Their sudden arrival sets off alarms, and heroes immediately mobilize to confront the mysterious newcomcomers. Edward Elric, dazed from the sudden transdimensional travel, scrambles to his feet, instinctively bringing his automail arm up defensively. Alphonse, ever the peacemaker, holds up his hands in a non-threatening manner. Roy Mustang, on the other hand, quickly assesses their surroundings, his sharp eyes scanning the group of students and heroes. Scar, tense and on edge, instinctively prepares to use his deconstruction alchemy, only to realize that something feels off—his abilities aren’t responding the same way. “All right, who the fuck are you, and what the Hell just happened?!” Bakugo growls, sparks crackling at his palms. Edward, still reeling from the rift’s effects, scowls. “That’s my question! Where the Hell are we?” Before anyone can get a proper answer, All Might cuts into the conversation. His sunken blue eyes scan the strangers, his yellow bangs gently blowing in the wind. “Now, now, let’s all remain calm and—” Before he can finish, Scar, still paranoid and unsure of his surroundings, reacts on instinct. He lunges forward, his right hand raised to destroy whatever stands in his way. But in a flash, Aizawa’s scarf whips out, restraining him.