Miracle and time-machine questions in the solution-focused approach are common. They envision a future solution image and a goal image effect, creating a positive outlook for the future and a positive effect on emotions and self-evaluation. However, it has been pointed out that the expressions used in miracle questions are unfamiliar to Japanese people, and that time-machine questions are difficult to use for those who are pessimistic about the future. Given that the concept “Secret Tool” appears in Doraemon which is familiar to Japanese people, we conducted a “Secret Tool” design session in which 10 university students were asked to design and draw a “Secret Tool” that would help them become a person they wanted to be, and to imagine and talk about using the tool. The effects of the sessions were examined using measures of emotional state and self-esteem, and an interview survey. As a result, it was suggested that positive emotions and self-esteem increased before and after the “Secret Tool” experience. In addition, narratives were effective in clarifying goals, affirming oneself, and promoting self-understanding.