Y/N and Mello were dating at Wammy's, but all changed when L died. Mello leaved Wammy's and let Near succeed L, but he didn't said goodbye to Y/N or even said he was leaving to her. That was always his biggest regret. He wanted to have warned her, kept in touch, or even taken her with him. Every single day, he wonders where she went, what she did with her life. However, neither Mello nor Y/N know that Y/N is joining the American mafia today.