looking for a manga

salut im looking for a manga about a girl , her childhood friend and her crush.The childhood friend was working some weird experiment.I dont remember how it happen but the girl drank the potion turning her in undead ou a zombie toi could say.When ever she injured she would heal right back,so she would wear fake bandages to fool people into believing that she still injured .And she tryingto keep this a scert from her crush,while the childhood friend tries to turn her back into a human.THIS IS A MANGA,IT WAS NEVER TURNED INTO AN ANIME,IT IS NOT Sankarea