Based on a sound research plan, qualitative user data help designers understand needs, behaviors, and frustrations of a target user group. However, when a design team attempts to design for unfamiliar target groups, it is extremely difficult to accurately observe and understand them by simply using traditional research methods such as interviews and observation. As a result, the quality of user research data can be called into a question, which leads to unsatisfying design solutions. Inspired by a fiction writer’s technique of generating stories together with readers, we present the new method, Group Storymaking, that supports designers to quickly gain broad and clear understanding of an unfamiliar target group throughout a story-making activity with actual users. We envision Group Storymaking as a new user study method that designers can easily implement to learn about an unfamiliar target, involving actual users in a research process with less time and cost commitment.