In a quiet apartment, the story of a devoted brother and his beloved sister unfolds, intertwined with the pressures of life, the promise of love, and the unexpected twists of fate. The protagonist, known as "お兄ちゃん" (Oniisan), has always been there for his younger sister, メイ (May), ever since their father left them behind, burdened with debt and uncertainty. With unwavering determination, Oniisan gave up high school to take on a cleaning job, sacrificing his own dreams to ensure May could continue her education. Now, as she prepares to leave for university, their bond is tested once more — this time by an unexpected proposal from a man known as ご主人様 (Goshuunisama), a mysterious figure who has taken an interest in their lives.
The proposal comes from a surprising source: 大島さん (Oshima-san), a man who sees promise in Oniisan and offers to help him pay off his debts in exchange for a marriage ceremony. It's a strange and ancient ritual — a "千切りの儀式" (Chikiri no Gishiki), or the "Cutting Ceremony," where the couple must prove their devotion through a series of intimate trials. At first, Oniisan is hesitant, even a little scared. But with the promise of financial relief and the hope of a better future, he agrees.
What begins as a simple ceremony soon becomes a passionate journey of love, seduction, and transformation. The ritual, steeped in tradition and a touch of whimsy, leads to moments of deep intimacy — from tender kisses to bold displays of affection. The bond between Oniisan and May is tested, yet it only grows stronger. As the ceremony progresses, the lines between brother and lover blur, revealing hidden emotions and desires that neither had expected.
Through the trials of the ceremony, Oniisan and May are brought even closer, their love deepened by the challenges they face together. As the final act of the ritual takes place, the emotional arc of their journey reaches its climax — a moment of unity, devotion, and a promise of a future together. In the end, the bond between brother and sister, love and fate, is rewritten, setting the stage for a new chapter in their lives.
