Heart no Kuni no Alice: My Fanatic Rabbit

A woman named Alice is taken by a man with rabbit ears named Peter to a perilous realm where all inhabitants carry weapons. Caught in a conflict among three factions, she is offered shelter at the Hatter's estate. There, she meets Elliot March, the Hatter's charming and appealing associate, who also has rabbit ears. Despite his likable nature, Alice remains unsettled by the knowledge that Elliot is a hitman capable of killing without remorse.