<p>We propose new Problem/Project Based Learning (PBL) prior learning materials using Manga Case Methods. The proposed method consists of Manga Case, question sets, and a table of questions and abilities. With the table, PBL instructors can choose question sets to improve the PBL abilities that learners lack. We conducted experiments on prior learning with the proposed method with 22 first-year university students specializing in management who have never taken any PBL classes. We used two types of question sets, each designed to improve different PBL abilities. We compared questionnaire results to confirm the effect of these experiments. The results show that the proposed method improves a series of PBL abilities like "ability to identify challenges" and "ability to evaluate and utilize information." The proposed method improves PBL abilities by changing the question sets and was found to improve PBL abilities in a three-hour workshop (1.5 hours of 2 units).</p>