Tensei Akujo no Kuro Rekishi OVA

Iana rarely gets a quiet life inside the world she wrote during her embarrassing teenage years, even when the occasion seems harmless. In one story, Yomi's jealousy rises around a birthday, leaving Iana to navigate feelings for which her old 'dark history' provided no reliable instructions.

On another day, a fever brings Iana and Sol into a situation where their usual distance becomes harder to maintain. Away from the grander threats to Iana's life, the two incidents show that jealousy or a simple illness can complicate her relationships almost as effectively as any deadly route she once wrote.