Masaya is a university student, but he attends a school that's not his ideal school. His days are generally gloomy. One day, he receives a letter from serial killer Haimura. He was convicted for nine murders and received the death penalty. Back when Haimura was committing his murders, he ran a bakery store. At that time, Masaya was a middle-school student and a customer at his bakery store. According to the letter, Haimura confesses to having committed eight murders, but he insists that he did not commit the last murder. Masaya begins to investigate the last murder case involving Haimura.

A ten-year love story told from the perspective of the selfish and eccentric main character, "I", who falls for Manami in high school but also navigates relationships with others from his adolescence.

Keisuke Isobe and Koume Satou live a rather dull life. But when Koume's crush breaks her heart, their situation becomes quite unordinary. She starts a "no-strings-attached" relationship with Keisuke, whom she had previously rejected, both finding solace in the other in order to fill the emotional voids in their lives.

Kaburagi was arrested as a suspect in a brutal murder case, but he escapes. He continues to hide and move all around Japan. During this time, he meets Sayaka, Kazuya and Mai. Detective Matanuki is on the trail to capture Kaburagi. He interrogates the people who met Kaburagi, but they all describe Kaburagi differently from each other. Kaburagi has been missing for 488 days. Who really is Kaburagi? What is his plan?

Haunted by past trauma, Hathaway Noa is drawn to a mysterious girl named Gigi Andalucia, whose strange powers stir memories within him. While swayed by her cryptic words, he continues preparing for Mafty's mission -- the attack on the Adelaide Conference. Meanwhile, Kenneth Sleg of the Earth Federation Forces prepares a defense operation for the Adelaide Conference and a plan to eliminate Mafty and is approached by Handley Yoxon of the Criminal Police Organization with a secret proposal. As Hathaway and Kenneth pursue their respective goals, Gigi also sets off for Hong Kong to fulfill her own role.