After Masato Inohara accidentally hit a baseball into the school's water main, the boys' dormitory was partially disabled. Until a plumber fixes the damage, the boys must stay in the girls' dormitory. To decide which rooms they will be assigned, they draw tickets from a hat. Unfortunately, because of the limited capacity, some of the boys will have to go without a bed. When Riki Naoe draws his ticket, he gets one that forces him to stay in one of the less-than-cozy clubrooms. Seeing his unfortunate situation, a nervous Kudryavka "Kud" Noumi gathers enough courage to confront her feelings while asking Riki to sleep in her room instead. Despite the rest of the Little Busters incessantly teasing Kud and Riki about their relationship, he stays with her throughout the summer. As they share unforgettable experiences one after another, the two realize that they might want to be more than just friends.