At the end of episode 7 of the anime, Yomi remembers Mato, wondering why she was trying to forget her friend. Though it's as heartwrenching as it is heartwarming, since the return of the negative emotions her relationship with Mato caused has her crying in pain.
A good portion of Episode 8. "Because we love you"
The near-final scene of the OVA, in which B★RS gets Dead Master out of Yomi's body with The Power of Love.