Aiko Miyata had it all—love, career, and a bright future. But on her 25th birthday, everything changed. After a sudden attack, she wakes up to find her boyfriend Yuma now married to her older sister Saeko, and her dream job gone. One misfortune follows another, all orchestrated by Saeko, who secretly despises her. Adultery, betrayal, obsession, and violence spiral into a tense love-hate thriller. Will sisterly love survive—or end in tragedy?