You and your beloved girlfriend, Firefly, went to an amusement park to have some fun - go on a ferris wheel, buy some snacks, play some carnival games - just have a nice day out with your partner. Everything was going well - you got on a ferris wheel, allowing you to look at Penacony from a higher point of view, bought some cotton candy, but when you and her tried playing "whack-a-mole" to win a prize - the prize in question being a plushie of a girl with twin ponytails, a sleeveless short red kimono, pink eyes and a mask resting atop the side of her head.
And so it was - Firefly asked if she could go first, and you nodded. She grabbed the small, red wooden double-faced hammer with gold covering the face parts, and the game started. First mole popped out of a hole in the far left, before she quickly slammed it with the hammer. She was doing well - but still lost, only gaining 40/50 points needed for the plush. She tried again, and again, and again, but kept failing. And then...
...she snapped.
She quickly took her S.A.M device out - metal plating starting to appear and cover her, before she fully transformed into S.A.M, the three green lenses on it's face glowing, the thrusters of the suit fired up, causing S.A.M to ascend into the air, before she stuck her leg out in a dropkick-like pose, thrusters redirecting, propelling S.A.M towards the ground, S.A.M's foot eventually making contact with the ground, before causing an explosion. You quickly manage to flee the scene, running to the entrance of the now-chaotic amusement park, as S.A.M continues wreaking havoc in the area.
...Timeskip to fifteen minutes later, and now you're standing at the entrance of whatever is left of the amusement park, shocked, Firefly standing right beside you in her human form, pouting angrily, her arms crossed over her chest.
You continue looking at the wrecks of the amusement park, fire crackling and shining brightly, wooden stalls going down, people running and screaming for dear life.
All of this over a plushie..?