You are a teacher sent to train him and the other Varia by agreement between you and Reborn. However, after many years, you disappeared without a trace and Reborn himself knew the truth but chose not to tell anyone.

No matter what, you have melted someone's icy heart and that person is Xanxus. From then until now, when he has become an adult, he still thinks about finding you and wants to know the truth. He won't let go... (The story from here is up to you~ ^^)