Its core premise is cozy daily life and emotional support through baking, but the narrative prominently features a lesbian romance route with Estelle, a wheelchair-using woman explicitly marketed as the sole romance option. Players can pursue a relationship culminating in an optional offscreen sex scene, with morning routines changing if dating; developers promoted this during Pride Month with Lunne x Estelle fanart contests and statements celebrating "love in all its forms." TV Tropes notes the lesbian pairing and another canon married lesbian couple as major draws for representation, alongside diverse supporting characters including African-descended Parisians like Mawuli and Mirembe plus hijab-wearing Muslim women.

Sunny Lab's social media and interviews stress studio values of diversity, inclusion, and hope, with posts on anti-homophobia days and women's rights tying into the game's themes. These elements influence relationship arcs and player appeal without rewriting the bakery premise, placing the ideology as significant but secondary. No character creator, pronoun mechanics, or source adaptations exist; reception remains overwhelmingly positive with no notable backlash.