Clover no Kuni no Alice - Sangatsu Usagi no Kakumei

From Mad Hatter Scans: The romance between the Hatter Mansion's March Hare (Elliot March) and Alice. A big man with adorable rabbit ears, and yet a mafia No. 2. In this colorful world, he gives orange smiles and holds a cold silver gun. On the surface he is ruthless, yet underneath he is as sweet as can be. Incredibly dangerous, incredibly sweet, a love story of Wonderland. A manga adaptation of the otome game Clover no Kuni no Alice that focuses on Elliot