『Curse- A solemn utterance intended to invoke a supernatural power to inflict harm or punishment on someone or something.』 Tsuna's twin sister, [Name], is cursed and he can't do anything about it but to watch how his sweet sister changed into a cold person. And now he has more problems to deal with which is the Mafia. Can this curse on [Name] break or will something unexpected happen to her? 「Reader X KHR male cast (I guess XD)」