Undercover Investigator~~Rules of the Fallen Yuka Arai

We know that there are investigators among them, so let's test your loyalty. Now, drink this poisoned wine! Yuuka, an infiltrated investigator, and her junior are in a predicament. Shibata. Kill me! In order to attract the enemy's attention, Yuuka sacrifices herself and entrusts Shibata with the mission... *The contents may differ depending on the distribution method.