After marrying a man with a child from a previous relationship, Ryoko Rinne finds herself increasingly alone with her stepson as her husband frequently travels for work. With their time together growing, hidden desires within her begin to intensify, eventually becoming impossible to suppress. Her stepson's mature scent and warmth stir her longing, drawing her into a whirlpool of new emotions. Forced to confront feelings buried deep within, she can no longer ignore the attraction that emerges during her husband's absence. Their stepmother-stepson bond begins to transcend ordinary family ties, threatening to cross into forbidden territory.