A Brief Introduction to the Characters: *Not a couple, don't fuck straight men in the ass

• Yin The untrustworthy senpai #1, lost half of his hearing in his left ear. Born into the army and discharged from the front lines after being surprise-attacked and injured, but after learning about the Cleaning Corps, he seemed interested and didn't apply to return to the front lines.

• Li The untrustworthy kouhai #1 who is about to become the untrustworthy senpai #2. One of many who enlisted in the army prior to the war, intentionally slacked off during the physical exam, and was eventually transferred to the rear.

• Ni Kouhai #2, doesn't appear in this series. A standard military academy graduate, but not interested in anything besides repairing machines, volunteered during the war for logistics. He took the opportunity to head the renovation of the base and equipment and lead medical services, work, and (most of the time) food on the condition that he can stay at the base. He'll become the only trustworthy one of the bunch.

• Xia Ye Has absolutely no connection with the military and doesn't appear in this series. To disguise herself, dresses like a mercenary. A self-professed noblewoman, but she can't read. Wanders all over the area and sometimes hangs out and teases the other three when she sees them. Sometimes helps, but usually freeloads.