Another part of the HIStory webseries follows the story of Shao Yi Chen, a man who dies in an accident involving his boyfriend, Jiang Jing Teng. Shao Yi Chen is reborn and sent back 9 years. To save his future self he avoids Jiang Jing Teng and avoids his feelings for him. Problem is Shao Yi Chen has loved Jiang Jiang Teng for a long time and has written about him in his diary. While destroying the diary, Jiang Jing Teng discovers a few pages. Causing Jiang Jing Teng to become curious about Shao Yi Chen. Will he resist the love of the handsome man Jiang Jing Teng and save his future self, or will he fall for the same man twice and risk his life?

Serina Hirakawa (Riisa Naka) is a deputy director at a public prosecutor's office. Her father (Yukijiro Hotaru) was a police officer, but killed. Kentaro was charged for murdering her father. Serina's father was investigating Kentaro and his involvement in a string of thefts inside of cars. Kentaro was found guilty for the murder. Serina Hirakawa admired Prosecutor Ryoji Tajima (Goro Kishitani) who extracted a confession from Kentaro.

Now, Serina works for Prosecutor Ryoji. One day, Kentaro insists he is innocent of the murder charge and kills himself in prison.

Several days later, Prosecutor Ryoji meets Attorney Kuromiya (Jiro Sato). The attorney defended Kentaro in the murder case. Attorney Kuromiya tells Prosecutor Ryoji about the real killer in the murder case. Soon, Attorney Kuromiya is found dead. Doubts about the death of Serina's father is aroused. Prosecutor Ryoji is suspected in the murder of Attorney Kuromiya. Serina is dumbfounded by the recent chain of events. She soon begins to investigate the two murder cases: her father's murder and the death of Attorney Kuromiya.

Shida Mirai, the young actress of Jyoou no Kyoushitsu fame, plays an average junior high school student who becomes pregnant with her lover's child. The drama will show her gradually maturing as the circumstances around her change.

While the public relations office of D Prefectural Police is having a confrontation with the correspondents' club, over the issue of the anonymity of perpetrators, it is decided that a Tokyo Metropolitan Police Department director will inspect the home of the family of the victim in "64", an important unsolved case with its statute of limitation about to run out one week later. The kidnapping and murder of Shoko-chan which took place in just 7 days in 1989 (Showa 64) was the worst in D Prefectural Police's history. The family of the deceased decline the director's visit to offer condolences. A gag order is imposed on those involved in 64 such as the investigators at the time. An iron curtain between the Criminal Investigations Department and the Police Affairs Department. A mysterious memo. Then a new kidnapping that happens right before the director's inspection, is a exact copycat of 64. -

The Tokyo Metropolitan Police Department decides to disband the special interrogation team Kintori. The team will be disbanded in 100 days, by September, 2021, but the the members of Kintori still carry out their jobs.

Frustrated by life with her boyfriend, thirty-something Wako can't stop herself from being interested in high schooler Yumeaki, despite the age gap.