The Reason My Boyfriend Married My Older Sister

Saeko (Takada Riho) chokes Aiko (Akita Shiori) and says, "You lost," with a look of hatred on her face. However, Aiko still tells her that she loves her sister, even after learning everything. As Aiko loses consciousness and nears the end of her life, what will happen to her? Yuma (Kageyama Takuya) rushes to her side and apologizes for not noticing Saeko's suffering, but Saeko leaves the scene. Immediately after, something strange happens outside...! What will be the outcome of Saeko's sad revenge...? And how will the relationship between Aiko, Saeko, and Yuma end?