To be clear: This book is quite often called a "retelling of Alice in Wonderland", but I don't really agree with that description. The book is full of references - for instance, you'll find an Alice (Icca's middle name), a Rabbit (Caro's last name), a Red Queen who asks for chopped-off heads, a Hattie (the Red Queen's first name), a Cheshire (the apothecary's last name), jabberwockies, and, of course, a Wonderland. And regular nonsense. But apart from that, Off With Their Heads has nothing to do with Lewis Carroll's classic.
It is quite fucked-up though, and confusing (probably on purpose). Fucked-up girls in a fucked-up world, lovers-to-mortal-enemies, siding with the Queen or against her. Slaying saints.
Oh right, that is a consistent Mikuta feature: Every one of her books is about killing religious entities. In Gearbreakers and sequel, the girls slay gods. In Off With Their Heads, they decapitate saints. …