Ibuki Takada was shown an image on a smartphone one day by Maya Iida, a friend of her girlfriend, Mizuki Yuge.

At the sight of Mizuki walking arm in arm and smiling with another man, Ibuki's world went dark, wondering if it was an affair.

Troubled about what to do, Ibuki turned down Mizuki's invitation to walk home together and consulted a reliable friend from the literature club, but it was to no avail.

Realizing a direct confrontation was the only option left, she decided to have Mizuki sit opposite her in the classroom after school and question her.

※This story is also posted on Kakuyomu.