A squadron of robots defends the planet against alien invaders. (Source: AniDB)

In the near future, massive hostile beings called Fiarem are waging war on Earth. To defend the world from this alien threat, Japan unleashes a special team known as Ragna Strikers—six young women wielding advanced weaponry and the ability to grow to gigantic sizes. Ragnastrike Angels follows Ayano Anemori and her friends as they live their daily lives and battle the violent Fiarem.

A great evil is sweeping over the realm; an evil that the young swordsman Roan and his life-long companion, the acolyte Yufa, must face head on! For these two travel toward their destiny, from the highest towers to the depths of the underworld, through forest and desert alike. With an ever-growing cast of fellow heroes, fate will grasp these travelers by their very souls and propel the band of skilled adventurers towards a noble end. Or ignoble, if they don't watch their step! Monsters are afoot and the way rife with danger and magic, the path forward may be unclear... But where will is strong, there is a way! Lessons wait in the depths of darkness, and good must prevail. The journey starts now! (Source: FUNimation Entertainment)

Japan, 1955: Mario Minakami has just arrived at Shounan Special Reform School along with five other teenagers who have been arrested on serious criminal charges. All assigned to the same cell, they meet older inmate Rokurouta Sakuragi—a former boxer—with whom they establish a close bond. Under his guidance, and with the promise that they will meet again on the outside after serving their sentences, the delinquents begin to view their hopeless situation in a better light. The seven cellmates struggle together against the brutal suffering and humiliation inflicted upon them by Ishihara, a sadistic guard with a grudge on Rokurouta, and Gisuke Sasaki, a doctor who takes pleasure in violating boys. Facing such hellish conditions, the seven inmates must scrape together all the strength they have to survive until their sentences are up; but even if they do, just what kind of lives are waiting for them on the other side?