Fuutarou Uesugi, a brilliant high school student burdened by a difficult life, faces isolation due to his aloof demeanor and financial struggles that haunt his family. A chance encounter with a transfer student over a seat dispute leads to animosity between them. Simultaneously, a lucrative tutoring job emerges, promising to alleviate his family's debts if he tutors a wealthy girl named Itsuki Nakano. Shockingly, Itsuki turns out to be the same girl from the seat quarrel. As Uesugi attempts to mend their relationship, he unravels a greater challenge: Itsuki is one of five identical sisters, each averse to studying and uncooperative. Despite their resistance, Uesugi persists, determined to transform the quintuplets' academic prowess and secure their graduation, a mission crucial for his family's welfare.