The Japanese word for "big" and the English word "heart"
To extract a Pure Heart Crystal
Daiheart is a Daimon that was created from the heart monument at the affection contest.
Daiheart was sent to the affection contest in her Daimon pod by Kaolinite to extract a Pure Heart Crystal from the winners of the contest, who were Naru Osaka and Gurio Umino. She extracted Umino's Pure Heart, before it was returned to him by Sailor Uranus and Sailor Neptune. Daiheart summoned minions who could look like humans and invite them to dance before revealing their true selves and attacking. Sailor Moon destroyed Daiheart.