69 (シクスティナイン , Shikusutinain ) is a roman à clef novel by Ryu Murakami. It was published first in 1987. It takes place in 1969, and tells the story of some high school students coming of age in an obscure Japanese city who try to mimic the counter-culture movements taking place in Tokyo and other parts of the world.
The main characters of Ryu Murakami's 69 are shown navigating adulthood in Tokyo
The characters are high school students in an obscure city. I think the system got it wrong because I used phrasing similar to a correct statement