Sister Sacrifices Herself to Save Brother from Yakuza Boss

In a dramatic act of familial devotion that ignites a passionate affair with a ruthless gangster boss—a true tale of sisterly sacrifice—Kana Momonogi has dedicated her body to save her reckless younger brother. After years of working tirelessly since her parents' passing to support him through school and life in the city streets of Japan, Kana's efforts are tragically undermined when her brother dives headfirst into gambling and joins an organized crime syndicate. When he returns home terrified after stealing money meant for his boss (the 'Daiku'), Kana bravely confronts the intimidating leader. Recognizing her stunning beauty instantly captivates the mobster; he agrees to clear his debt but demands a steep price: she must become his exclusive woman for ten days! Her new reality is one of constant sexual availability—clad only in seductive lingerie or completely nude—ready for his powerful urges. Despite having a loving boyfriend, Kana finds herself utterly addicted to the colossal, dominant cock of the gang leader. The sheer intensity of his passion eclipses everything else, making her body crave his touch uncontrollably. As the ten-day ultimatum nears its end, granting freedom and saving her brother, Kana realizes she doesn't want to leave. She yearns to remain captive in his arms, eternally claimed by his massive member, forever basking in the glorious happiness their scandalous arrangement provides.