Collar (Rules)

String

Water-Phone

Breasts

First Campaign

Thicket

Collar Bone

Collateral

Affection

Passive

Droplet

Dream Puppet

Apocalypse

Distance

Body Heat

Transparent

Throbbing

Doll

Drifter

Telepathy

Choice

Happy On The Floor

Dash

Plea

Lovely Drippings

Leaving

Appeasement

Time Flies

Naked Body

Dream Time

Quiet Desires

Regrets

Subsun

Twinkling Snow

Kotodama

Sundome

The "Roman Club," a school group interested in the occult, to which he's practically enslaved, has become boring for one Hideo Aiba. In fact, he finds his entire existence pretty tiresome until, one day, when a girl named Kurumi Sahana shows up and wants to join up. When the two are left alone in the club classroom, Kurumi makes a special "request" of Hideo, which makes him (understandably) freak out. Though he doesn't know what to think, one thing's for sure, Hideo's life just became anything but boring.
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(Source: Yen Press)