Kiyoi Kugii ni wa, Buchou no XXX ga Mieru Rashii

When Director Waragaki wakes up at three o'clock in the morning... he finds his subordinate, Kiyoi Kugii, straddling him half-naked! Kugii claims to be helping dispel the ghost haunting Waragaki, but could he have another motive?
(Source: Renta!)
Note: Chapter count includes an extra.