After a childhood tragedy, Riki Naoe finds solace with the group 'Little Busters,' who become his closest companions. In high school, their aspirations of heroism wane but their bond remains strong. Riki embarks on two missions: recruiting girls to balance their group for a baseball team and unraveling mysterious messages hinting at a 'secret world.' As secrets unfold and tasks emerge, Riki and Rin, the sole girl, question the reality of their childhood fantasies. Amidst personal struggles and budding romance, Riki delves into a quest that may demand superheroic courage to uncover the ultimate truth behind the enigmatic Little Busters.