The eldest daughter of a prestigious family, Reika Aizumi, faces the challenge of choosing a marriage partner. At a matchmaking party held for this purpose, an invited guest named Tsukamori suffers a humiliating incident. As a result, he swears twisted revenge. He tells Reika, "This is my thank-you gift for inviting me to the party. Don't try to run away. If you do, I'll kill you." A single misstep triggers a dark tale. A tense, gripping narrative unfolds.