It was Meiji 38 (1905), the Russo-Japanese War that had begun since the previous year was getting hard. In this severe circumstance, they reorganized the Raimu Squad. The members of the Raimu Squad were the girls. They were just like other ordinary girls who went to schools and yearned for love, except that they had "Raimu." Inukai Tsuyoshiro was a young man who was newly chosen to be the leader of the squad. He was ambitious to fight for Japan. When the young man met the five girls, the new chapter of "Raimu" began.

The story revolves around Nikolai, apparently a part-cyborg; Galory, a young boy who apparently is part human/part Crest person, and Althea, who is entirely a Crest person. Seems the Earth and the Crest people were at war for 300 years so there's still a lot of bad feelings present. The ship Galory, Nikolai and others are on is ambushed and almost everyone killed by some kind of automated attack ships from a huge Crest ship that has been taken over by an automaton. Galory, Nikolai and Althea go to the ship to try and see if there are any survivors of an advanced party from Galory's ship that can be saved, and to see if they can destroy the Type 38 automaton in the ship's core.

Yukiya, who is "probably" 14 years old, spends his time DJ-ing alone. Due to his father's influence, he's listened to house music since he was young, and he uploads videos online. He wants to convey something to someone. He wants to be recognized, and become important. But getting hurt is scary. One day, while trying to get more views, he does something that can't be undone. And he sees a live broadcast from "that world." Yukiya believes he can't do anything alone, but that he could accomplish something if he were doing it together with someone else. (Source: ANN)

Forming a party with one's mother in an online game seems not only unlikely but also uncomfortable to most teenage gamers. Unfortunately, Masato Oosuki finds himself in that exact scenario. After completing a seemingly meaningless survey, he is thrown into the world of a fantasy MMORPG—and his mother Mamako actually tagged along with him! On top of all of that, Mamako turns out to be an overpowered swordswoman, possessing the power of two-hit multi-target attacks! After minor tension between the two, they search for party members, meeting the merchant Porta and the sage Wise, starting their journey to clear the game. [Written by MAL Rewrite]