Die Heart (ダイハート Daihāto) is a Daimon created from the heart monument at the affection contest. She appeared in Episode six of Sailor Moon S.
Die Heart was sent to the affection contest in her Daimon pod by Kaorinite to extract a Pure Heart from the winners of the contest, who were Molly and Melvin. She extracted Melvin's Pure Heart, before it was returned to him by Sailor Uranus and Sailor Neptune. Sailor Moon destroyed Die Heart.
- Daihāto is a pun on 大 (dai), which means “big,” and ハート (hāto), which is the Japanese spelling of “heart.”