Kiyoi Kugii ni wa, Buchou no XXX ga Mieru rashii

When department head Waragaki jolts awake at 3 AM, he discovers his subordinate Kiyoi Kugii straddling him in nothing but underwear. Kugii insists he's only trying to exorcise a ghost that's been haunting Waragaki, but his real intentions seem far less supernatural.