The story revolves around Suzunoki Hatsune, a normal high school girl... or so she strongly wishes, because she has no desire to succeed her stepfather as the strongest onmyouji in modern Japan. Still, she has the ability to see spirits, and as luck would have it, her emerging abilities are pointing her to a terrifying truth behind the deaths of her parents... and her stepfather may be involved!?

Everything begins with an odd looking amulet lost by a stranger and picked up by ordinary high school girl Fujimi. Wrong. Actually, it begins with a new, haunting song, and goes on with a monster chase into the night.
What is the secret behind all this?

From Viz:

It seems like 15-year-old Kazuya Hasukawa's life can't get much worse. Not only did his older brother marry Kazuya's first love, he brought his bride home to live with the family! Leaving his own home, Kazuya enters an exclusive all-male boarding school, Ryokuto Academy. Unfortunately, a prestigious education is little compensation for getting stuck with the cross-dressing roommate from Hell...

Note: There are more volumes in the original Japanese publication compared to the Viz release because Viz has excluded unrelated one-shots that do not involve the Greenwood characters.