Marina, a lesbian who vowed to comfort Izumi Shiina after the loss of her husband, draws her into a forbidden world. "I'll take your husband's place and comfort you," Marina declares, captivating Izumi completely. Meanwhile, Sumomo, Marina's lover, notices the growing intimacy between Izumi and Marina, igniting fierce jealousy within her. The tangled web of love and resentment among the three gradually tightens, evolving into an ambiguous relationship. Izumi's heart is drawn to Marina, while Sumomo, though fearful of Izumi's presence, finds herself unable to suppress her conflicting emotions. As their feelings intertwine, a new romantic dynamic unfolds between the three women.