Enlighten me

[Cells at Work! BLACK]
"Worried about the possibility of the return of a scenario she would never want to relive, the young pink-haired warrior leaned her back against the wall of a narrow capillary and closed her eyes. A heavy sigh escaped from between her lips, while the hand gripping the hilt of her sword had begun to tremble. J-1178's nerves were on edge, her mind crowded with sad thoughts from a dark past that she wished she would erase."
[Post! chapter 39 of Cells at Work! BLACK manga] [What if?]