Does the new girl in Riki Naoe's life need his help, or is she actually trying to kill him? After a chance encounter on a rooftop brings the enigmatic Saya Tokido into the Little Busters' world, the only thing that's certain is that trouble is sure to follow. As if saving the lives of his teammates wasn't enough of a task to handle, now Riki must also untangle a web of new mysteries that seem to be rooted in his own personal past! Who are the Dark Executives, why do they want to keep Saya and Riki apart, and what is the nature of the secret treasure that Saya seeks? Sometimes, answers lead to even more questions as Riki and the Little Busters discover that they weren't the only people drawn into Kyousuke's artificial world in LITTLE BUSTERS! EX!