Night Secret at Office

Last night, I was working alone on my PC. Everything seemed fine at first. I had a pile of work that prevented me from leaving early. At the beginning, nothing unusual happened in my room. But after about three hours, the door suddenly opened and closed very quickly by itself. Then, I noticed a bad smell filling the room.

Feeling uneasy, I finished my work as fast as I could and hurried back home. Once there, the memory of the night gave me chills. To calm myself before going to sleep, I drank some matcha tea.