A missing persons case is dumped onto Shugo one day. Yura... the girl he had an intimate relationship with before being sent to war. But he soons finds out she's not the only one missing.

The year is 1905 in the Engine City London, where the air is so thick with smoke that a glimpse of the blue sky is considered a miracle. Mary is a girl living by herself while her mother works abroad. She attends university with her friends until she forms a contract with a strange man in a black suit, and begins to help him hunt dark creatures...

Yamada Nagito, a university student living away from home, needs a cheap place to live. He finds out about a mysterious House that grants wishes on the market for a ridiculously low rent; he snaps up the house and starts living there. A few nights in he starts hearing strange creaking noises.

A woman with eyes of jade stands before You, informing You that You are the Master of the house, and she Your Maid. However, You have no memories, no concept of self, or indeed, any certainty that You are even alive.

One day the timid Toomi Yuna met two ghosts on the roof during lunch. The two kindred spirits died with unrequited feelings in their hearts, met, and fell in love. They ardently wish to experience their 'first time' together before their eternal rest. They enlist Yuna to help them create more yuri couples at the school so that they can glean some insight.