Description：Natsuhara Yukikai (Matsumoto Wakana) has been the focus of everyone's attention in her class since middle school. After graduation, she got married and had children. Her happy life is a model. However, misfortune fell on her without warning. She and her family became victims of a bloody and brutal murder case. All signs show that the murderer was not seeking money, but more like a revenge. Tanaka Takeshi (Tsumabuki Satoshi) is a newspaper reporter who decided to dig out the truth behind the case. Takeshi has a sister named Mitsuko (Mitsushima Hikaru), who was imprisoned for abusing her biological daughter to death and was diagnosed with mental disorders. Takeshi visited Natsuhara's former alumni and friends, and an unknown dark history of hers gradually surfaced, and this history was unexpectedly related to Mitsuko.