The main love interest of the game The Lapis Lazuli Ring. He is the crown prince of the Lapis Lazuli kingdom. He was originally engaged to Tiararose.

On the day before her downfall, Lady Tiararose Lapis Clementille recalls that she is in an otome game that she had once played in her former life. She used to adore the main love interest Prince Hartknights Lapis-Lazuli Lactomuth, but unfortunately, she was not reincarnated as the heroine, but rather as is his worst enemy—the villainess fiancée.
 
At their graduation ceremony, without blinking an eye, Hartknights condemns Tiararose for alleged crimes, breaks off his engagement, and proclaims the heroine Akari as his new bride-to-be. No matter whether Tiararose is innocent, he banishes her from the kingdom. But before her sentence can be carried out, a shocking figure appears. Aquasteed Marineforest, the prince of a powerful neighboring country, has been harboring feelings for Tiararose for quite some time, and announces his intention to marry her!
 
Adored by the prince of another kingdom, what awaits the villainess on her path to a happy ending?
 
(Source: MAL Rewrite)

Tiararose Lapis Clamentile is set to marry Hartknights, crown prince of Lapis Lazuli—until she suddenly remembers her past life and realizes she’s been reincarnated into her favorite game, The Ring of Lapis Lazuli, as the doomed villainess! But just as she’s about to lose hope, the crown prince of Aquasteed proposes instead. Could this unexpected turn finally lead to a happy ending of her own? 
 
(Source: Crunchyroll)

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Hartknights Lapis-Lazuli Lacmouth