Vividred Operation

Akane Isshiki, a 14-year-old girl from Oshima, lives with her younger sister Momo and grandfather Kenjirou, a prolific inventor. Despite their poverty, they lead a happy and carefree life, with the Manifestation Engine on Blue Island providing a stable energy source. However, their peaceful existence is disrupted when an unknown threat, the Alone, targets the engine. Akane takes on a key role in the battle against the Alone, donning a red "Palette Suit" that unleashes considerable power, and she's soon joined by a group of allies.