Caramel Espresso

All that Sayu wanted was to get through his university life in peace, but all hope of that happening goes crashing down when he gets himself entangled in the tumultuous life of shy, pretty Aki and his intense, seductive split personality Aoi. How did Aoi end up changing Sayu's dominant hand, and why does this mean he has to pretend to be Aki's lover?

(Source: Futekiya)