Synopsis
Yōta deeply trusts and admires his mother, Shiori Kawachi. Unlike his workaholic father, Shiori has always been devoted to family life, nurturing Yōta with love and care for years. She faithfully supported the household despite her husband’s frequent long business trips, but secretly suffered from loneliness and sexual frustration. Concerned about his mother’s occasional sighs and melancholy expression, Yōta wished he could help, but found no words to comfort her.
While shopping in the entertainment district, Shiori unexpectedly reunites with Masao Gyakushio, a former mentor from her university days. Unaware of his hidden lustful intentions toward her, Shiori naively invites him to her home. Masao, who had harbored desires for his former student, seizes this opportunity. He listens to her marital troubles and gradually exploits her emotional vulnerability. When he suddenly touches her intimately, Shiori is shocked and conflicted—unable to firmly reject someone she owes so much to, she finds herself surrendered to him.
Afterward, wracked with guilt over her betrayal, Shiori initially refuses his proposal to continue their affair. But her starved desires override her resistance, and she agrees. Masao begins visiting during the day when her husband and son are away, indulging in her mature body. Soon, he brings his own son Masafumi and his friend Jack, and the three men engage in group sex with Shiori. Despite her reluctance toward his son and Jack, their overwhelming sexual prowess makes her cry out in pleasure.
Shiori dreads anyone discovering her infidelity, especially her son Yōta. But one day, when Yōta leaves school early due to illness, he witnesses his mother in their bedroom—no longer the gentle, dignified woman he knows, but moaning like an animal as Masao thrusts into her. Yōta struggles to accept what he’s seeing.
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