Single mother Miina struggles to pay the rent with her part-time wages and is forced to accept help from her landlord's only son, Masanori, in exchange for favors. Masanori, slightly cunning by nature, exploits Miina's vulnerability and gradually begins making sexual demands. Though unsettled by his youthful, underdeveloped body—similar in age to her own son—Miina's uncontrollable desires grow into overwhelming lust, spilling from her lips in hot, desperate breaths.