Cant remember name dont no if anyone can help but here goes. Read manga in 2014-2015 Post apocalyptic world kid/guy transform into a mini armored demon with fire powers and girl bunny character befriended him but shes genetically made to defeat him(shes ice to extinguish his fire something like that and they both "die" in the end Never comfirmed if either actually dies It was a mini series i think it was in a shonen jump competition or something like that Can anyone help!?!?!?!?