"Alice in the Country of Diamonds: Bet On My Heart" is a manga adaptation set in the "Alice in the Country of" universe, a series inspired by Lewis Carroll's "Alice in Wonderland." The story centers on Alice Liddell, a young woman who finds herself transported to a surreal world where familiar Wonderland characters inhabit a society governed by unique rules and dynamics. In this installment, the narrative unfolds in the Country of Diamonds, a region characterized by its gambling-centric culture and a focus on risk and chance.

Alice becomes entangled in the lives of the Diamonds residents, who are personifications of the original Wonderland figures. The central conflict revolves around Alice's interactions with the Diamonds' inhabitants, particularly their penchant for high-stakes gambling. The story explores themes of trust, risk, and emotional vulnerability as Alice navigates her relationships with these characters. Key figures include Julius Monrey, the stoic and enigmatic clockmaker; Blood Dupre, the charismatic and manipulative mafia boss; and Elliot March, the impulsive and hot-tempered rabbit. Each character embodies distinct traits that influence their approach to gambling and their interactions with Alice.

The plot delves into Alice's struggle to adapt to the Diamonds' culture, where decisions are often made through games of chance. Her growing connections with the residents force her to confront her own fears and uncertainties, particularly regarding trust and emotional attachment. The narrative balances moments of tension and intrigue with lighter, character-driven interactions, creating a dynamic exploration of Alice's journey in this peculiar world. The manga maintains a focus on the interplay between the characters' personalities and the overarching themes of risk and reward, offering a fresh perspective on the Wonderland-inspired setting.