This project has been dropped due to Mangafox.
Siesta is set in a fantasy Europe of perhaps industrial era. The plot evolves around ESP-like ability called "Bullet" powers. Early part of volume 1 spend a great deal of efforts to explain what bullet users are and where their social position lies.
The protagonist is Dia Canto, a weak bullet user on surface but a monster inside. She is a passive but an outgoing girl who eventually becomes Cid Leon's guardian (supposedly).
Cid Leon starts off as a really spoiled child, perhaps rightfully so since he was born into a mega corporation that is more powerful than a local government. But his spoiled and rotten personality knows no bound. With complete lack of understanding of society, it falls to Dia Canto who has to breath common sense into him.