is a Japanese shōjo manga series written and illustrated by Aya Shouoto.
It has been serialized in Sylph (magazine) since 2008, and has been collected in five tankōbon volumes by MediaWorks so far.
On the eve of her sixteenth birthday, Kozue Hiyoki is visited in her dreams by a man who steals her heart- literally!
Determined to find him and retrieve her stolen heart, Hiyoki enrolls in the S-Hall dormitories of St. Nazareth Academy, but quickly realizes that its residents are not at all like she expected... for starters, they are all guys.
Outside Japan the series is licensed by Soleil Manga in France.