It's an acquired taste.

Mikan Sasaki, an office lady in love with her Chief, Akutsu, is deeply concerned about the swarm of evil spirits she constantly sees clinging to him. A truly wicked presence has recently appeared among them, intensifying her worry.
The day after her lonely birthday, fate intervenes: Chief Akutsu finds her drinking in the park and takes her back to his place. Mikan wakes up the next morning with no memory of the night before and a bandage on her arm. Convinced she caused him trouble, she asked how she could repay him.
His shocking reply: ""I'd like you to sleep with me.""
Lying next to him in his room, her heart races. The request is confusing, but Mikan is now closer than ever to the man she loves―and to the dangerous spiritual burdens he carries.
An intimate, supernatural love story about an awkward pair getting closer every night.