A series of grotesque murder cases takes place on rainy days. Detective Hisashi Sawamura (Shun Oguri) works to catch the murderer like he has done with past cases, but he soon realizes the murderer's next target is his wife and son. A man in a frog mask is a suspect.

When Chihaya Ayase was in the 6th grade of elementary school, she met Arata Wataya. Arata Wataya transferred from Fukui Prefecture. Taichi Mashima was Chihaya Ayase's friend since they were little. Arata got close to Chihaya and Taichi from the card game 'karuta'. Four years later, Chihaya is a high school student. Chihaya learns that Arata, who went back to Fukui Prefecture, doesn't play karuta anymore. Believing they will meet Arata again, Chihaya and Taichi start a karuta club at their high school.

Sayaka Kudo is a gyaru who wears miniskirts and dyes her hair blonde. Although she is a 2nd year senior high school student, she is on par academically with 4th grade elementary school students. She frequently transfers between school because she is unable to make friends, and was once suspended for being caught with cigarettes. To prepare her for her university entrance examination, her mother decides to send her to Seiho Cram School. However, when the school director, Yoshitaka Tsubota, hears about Sayaka's academic problem, he makes it his personal achievement to help her enter the university of her choice, Keio University, a prestigious university that is considered one of the most difficult to enter in Japan. After her father labels her an "air-head", Sayaka became determined to study hard to prove her father wrong. Over the course of the summer holidays of her second year through to the exams at the end of her third year in senior high school, Sayaka studies extremely hard. She ...

Following the karuta tournament in Tokyo in the prequel, Chihaya's team is ready for national championship. However, Chihaya is disappointed to hear that a childhood best friend from whom she drifted apart has quit the game. She pours her time and energy into training for the nationals, but in the process sacrifices a lot within and without. Written by aghaemi

The movie begins in the year 1995 where there were 5 peculiar murder cases. The murderer would always get someone close to the victim to witness how he would strangle the victim from behind with a rope but he would let the witnesses go and speak to the media on how the murders happened. Ito plays the role of Makimura, the police detective who was in charge of investigating the serial murders but failed to catch the cunning murderer and his respected superior ended up being killed as well. 22 years later in 2017 when the case is nearing its statute of limitations, a man named Sonezaki claims to be the culprit for the 1995 murders and even publishes a book titled "Watashi ga satsujinhan desu" to talk about the cases. Despite the disgust towards Sonezaki's actions, the intensive attention showered on him via the media and SNS makes him become the talk of town.