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'If love has an expiration date, a grace period is needed for separation.' Na Rin could not easily accept the breakup with her long-time lover Eun Chan after being informed of the sudden breakup, so she wants to have a one-month grace period for Eun Chan's feelings to return. "Love always ends out of the blue, and parting is always difficult." But as Na Rin jumps into the album production project for "History of Love," she's in a position to think about "breakup" more than anyone else. Can Na Rin find the purpose of the breakup that she has postponed?

Tanaka Nozomu is one of the three high school students. People call her "Baka" ("Idiot"). She isn't timid and she can't read between the lines. Her friends are Kikuchi Akane and Saginomiya Shiori . Akane enjoys anime and manga. Shiori is extremely smart, but her emotions have dried up. These three girls are also classmates. Their homeroom teacher is Sawatari Masataka.

Through handling a dead body case, Gao Feng, a policeman from a family of police, discovers the case related to his grandfather and father many years ago. During the investigation, he encountered many obstacles and tried to find the truth behind the case