Eris spends her days at the church to which she was assigned. However, the church is in such terrible disrepair that hardly anyone comes to visit, leaving her at a complete loss. It is then that she comes up with the idea of using her own body to collect donations from the townspeople.

"Haruuri Card Gamers" is a card game RPG with simple and fast-paced battles, designed to be accessible even for those unfamiliar with card games. Players strengthen their decks by purchasing booster packs and aim to collect rare cards desired by female characters, which can lead to adult-oriented interactions. The game features a dramatic story mode involving a battle against an evil prostitution organization, a campaign mode with tempting character interactions, and a challenging mode with random enemy decks and tough bosses. The narrative includes mature themes and character-driven stories.