Odera Shuuichi, a student preparing for college entrance exams, unexpectedly ends up moving into the all-girls dormitory of the university his sister attends. On his first day, he is warned not to be caught by the girls, but he is discovered by his sister's friends. Surprisingly, they all cooperate with him because they all have a desire for a younger brother. In exchange for their help, Shuichi agrees to be their "younger brother" and they offer to teach him as he prepares for his exams. This marks the beginning of Shuuichi's thrilling and risqué "Passing Prayer! Brother Share (Rental) Life."