Serina Hayakawa lived happily with her kind husband until one day she began attending a yoga class. However, her peaceful life was suddenly shattered when her yoga instructor, Kawaguchi, blackmailed and forcefully took her. Fearing her husband would find out, Serina was forced into submission, enduring his abuse in silence. But eventually, her husband discovered the truth. The secret that had been festering between them finally erupted, and the devil himself invaded their home, completely destroying their lives together.