Riki Naoe is a high school student with narcolepsy who was taken in as a child by a close-knit group of friends calling themselves the Little Busters. Now in his second year, he continues to spend his days alongside the group’s leader Kyousuke Natsume, the brawler Masato Inohara, the stern Kengo Miyazawa, and the shy Rin Natsume. The Little Busters! Ecstasy manga expands on the original story by adapting three separate heroine routes that were added in the expanded version of the visual novel, each published as its own volume.

In the first volume, Tokido Saya - School Revolution, Riki is dragged into a covert conflict by Saya Tokido, a stern and capable member of a special disciplinary board. Saya is determined to eliminate a shadowy organization operating within the school, and she enlists Riki as her unwitting backup. Riki suspects that the whole chaotic situation may be another elaborate scheme orchestrated by Kyousuke, but he is quickly pulled deeper into the danger. The arc blends school-life antics with a suspenseful, action-oriented plot as Riki and Saya work together to uncover the truth behind the mysterious association.

The second volume, Sasasegawa Sasami - Black Cat Fantasia, centers on Sasami Sasasegawa, the proud and competitive captain of the school’s softball team. Her story takes on a more whimsical and slightly supernatural tone when she becomes entangled with a black cat that seems to be connected to a hidden world of fantasy and rivalry. Riki finds himself helping Sasami navigate her personal struggles, including her fierce determination to prove herself and the emotional walls she has built around herself.

The third volume, Futaki Kanata - My Minroud, follows the quiet and responsible Futaki Kanata, the student council secretary who often finds herself caught between her duties and her troubled relationship with her younger sister, Haruka Saigusa. Kanata’s route delves into themes of family obligation, hidden guilt, and the weight of expectations. Riki’s interactions with her gradually reveal the painful secrets she carries, and he must help her confront the past in order to move forward.

Across all three volumes, the familiar setting of the high school remains central, with the Little Busters’ trademark blend of camaraderie, humor, and emotional depth. Each heroine’s arc explores a different facet of Riki’s personality and challenges his role as the group’s heart, while the wider cast of the Little Busters appears to support or complicate the journey. The manga adaptation closely follows the branching narrative of the Ecstasy visual novel, offering readers self-contained stories that highlight the unique conflicts and growth of each new heroine.