Yuna Kagurazaka, a clumsy and sweet sixteen year old girl, had her life drastically changed when she won an intergalactic contest for the person with the purest heart. Now, she is an intergalactic superhero and magical girl known as the Savior of Light. She pilots the mecha El Line to maintain the peace of the universe. But Yuna’s entire world is shaken when she is wrongfully accused of destroying a city with El Line. She is captured and taken prisoner by Misaki Ichijouin, a special agent from the Galaxy Alliance. However, Misaki soon realizes that she has been deceived, and teams up with the rest of Yuna’s friends to free the Savior and save the galaxy before an evil force is restored to power.

Eustachius no Shitamachi Sennyuu Dai Sakusen (Eustachius' Incognito Operation Downtown) To get more information about Myne and her strange background, Head Priest Ferdinand sends two nobles, Eustachius and Eckhard, to investigate everything regarding her life within her hometown. However, things do not go the way they expected. Corinna-sama no Otaku Houmon (Visiting Missus Corinna) Otto's wife, Corinna, takes an interest in the outfit that Myne wore at her baptism. Corinna summons her alongside her mother, Eva, and sister, Turi, wishing to know the procedure in making such sophisticated attire and accessories. Naturally, for Myne, she sees an excellent opportunity for profit.

By A.D. 2010, all men have died off quickly due to a dramatic change in the environment and an unknown contaminant. The population decreased to the lowest number ever seen...until only the women were left alive. They live huddled in small corners of a world mostly reclaimed by nature. There are those who accept their inevitable extinction and live a carefree life... There are those who try to continue on the race with the help of science... It is a society of constant conflict over their differences of principles and policies. The story takes place in the center of Tokyo. It is one of the places left for them. The conflict over the specimen of "ICE" and the chance it may provide to save humanity begins.