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Kanbe Takeru chooses to remain in the Special Missions Division, but he seems to continue to keep a distance from his direct superior, Sugishita Ukyo. One day, the dead body of the popular female novelist, Mizumoto Shoko, is found in her own home. The possibility of murder fuelled by a grudge is high from the situation at the crime scene, and a male stalker emerges in the line of investigation. However, Ukyo focuses his attention on a missing section from a document package for a new book that Shoko was working on. It is eventually determined that Shoko was attempting to write a novel with an environmental theme which is completely different from her style of writing so far. Ukyo and Kanbe try to get information from the employees at a trading conglomerate that Shoko had interviewed.

Kiriyama Rei is a 17-years-old shogi (Japanese chess) player. He debuted as a professional shogi player when he was in middle school. He lives by himself in Tokyo, because his parents and younger sister died in a traffic accident when he was little. One day, Kiriyama Rei meets three sisters who are his neighbours. The three sisters are Kawamoto Akari, Kawamoto Hinata and Kawamoto Momo. This is his first meeting with someone outside of the shogi world in many years. Having meals with the Kawamoto family brings warm feelings to Kiriyama Rei. As Kiriyama Rei continues his shogi career, his interactions with his neighbours allow him to grow as a shogi player and as a person.

He's unable to cut neither one out of his life. One is his mother who loves and wishes him well above all else. The other is her, with depression, in which he has to understand and care for.