Lover Limit Breaks are group oriented ultimate abilities that can alter the outcome of a battle.
Limit Breaks are specific to each party role. Tank's limit breaks reduce the damage taken for the entire party for a short time. Damage Dealer's limit breaks deal a massive amount of single target. Caster's limit breaks deal devastating area of effect damage. Healer's limit breaks restore HP and MP to the entire party. Lover Limit Breaks™ on the other hand produces many many Loves.
For example, Culinarian and Weaver are both heavy damage dealers. They can both use the Lover Limit Break (as shown in picture with hearts radiating outwards) to produce waffles/pancakes/muffins placed in an adorable basket.
Lover Limit Breaks™ are only usable in a party environment. There are 4 levels of limit breaks, use it wisely Daniel-san.