Aosaka Ao (Inoue Nagi), a hard-working honor student who failed the first semester exam at a national university, was said to be sure to pass, is invited by his classmate Murase Yu (Fujioka Maito), who also said he failed, to take supplementary lessons to prepare for the second semester exam. Aoi is a quiet and inconspicuous type, and Yu is a bright and popular person. The two, which had never met before, face each other's essays for three days, bringing each other closer together, but Yu is carrying a "single lie" that Aoi can't tell...