The closest official experiences to a "PSP-style" game are the releases on the and Nintendo 3DS : Attack on Titan (Wings of Freedom)
The game takes place within the world of Attack on Titan, specifically within the walls of humanity's stronghold. You play as a rookie member of the Scout Regiment, tasked with exploring outside the walls, reclaiming lost territories, and fighting against the Titans. The story is an original narrative created for the game, featuring characters that are not part of the main manga or anime series but still deeply rooted in its lore. The storyline explores themes of camaraderie, sacrifice, and the struggle for humanity's survival, staying true to the spirit of the series. attack on titan psp game