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.

About to enter junior high school, Karada Iokawa is a cheerful and reliable girl, who hates being treated as a child more than anything. After her parents' deaths, her older brother, Hiro, comes back from studying abroad to take care of her. His ex-girlfriend Shouko Nogami, a composed yet sometimes childish and stubborn young woman, follows him to Japan in order to find out why he left her. Between the two girls, the atmosphere is tense, which eventually leads to Shouko calling Karada childish. Later, Karada stands before a shrine praying to grow up. Little does she know that the shrine wishing stone would grant her wish. As Karada grows older, at the same time, Shouko, who happens to be nearby, finds herself a child once again. With their ages now reversed, Shouko and Karada must come to terms with one another and ultimately themselves.

The main additions in "Little Busters! Ecstasy" are 3 heroine routes involving the characters Futaki Kanata, Sasasegawa Sasami and Tokido Saya. The 3 EX heroines' routes take place of the following: Saya's route - Before the events of Refrain. Sasami's route - After the events of Refrain. Kanata's route - First half of her story is before Refrain and second half is after Refrain. The episodes will be bundled with the BD/DVD releases of Little Busters!: Refrain.

Years ago, the gods fought against each other before being sealed away. However their artifacts remained in the souls of the HuaXia clan as part of a contract and hope that someday in the future, they will awaken once more using those artifacts. (Source: Baka-Updates Manga)