Context: Requirements-elicitation is one of the essential steps towards software design and construction. Business analysts and stakeholders often face challenges in gathering or conveying key software requirements. There are many methods, and tools designed by researchers and practitioners, but with the invention of new technologies, there appears to be a need to make requirements gathering and design-rationale process more efficient. Storytelling is an emerging concept and researchers are witnessing its effectiveness in education, community-building, information system, and requirement elicitation. Objective: Objectives of this study are to i) devise a method for requirements elicitation and improving design-rationales using story-based technique; ii) evaluate the effectiveness of the aforementioned proposed activity. Methodology: To answer the research objectives, we have i) conducted open-ended interviews to get feedback on our proposed method; ii) case requirement from a running project to map how this method can be useful; and iii) performed empirical evaluation of the proposed card-based activity. Result: i) Our regression model has shown that participants' perception regarding the ease of use and the fun in the game has an ultimate effect on requirements elicitation through enhancing user's desire to play the game, hence, increasing the collaborative learning outcomes of the game; ii) Our results have shown that using team-based activities helps the less-experienced designers to argue through design rationales and better elicit software requirements. Our results have reinforced the finding that using game-based solutions not only enhances communication and develops trust between stakeholders but also helps in motivating participants of requirements activity; iii) Initial results (from interview and empirical evaluation) for the proposed technique and method show positive results. Improvement in the process and activity as suggested by the participants will be accommodated in future studies.