"きりはらの森" is a free app developed by Kirihara Shoten K.K. for learning their popular educational materials. This app offers the flexibility of both traditional learning through physical textbooks and on-the-go learning using smartphones or tablets. By combining these different learning methods, it allows for more efficient learning outcomes. Kirihara Shoten aims to support all learners by releasing this app, which provides multiple features to assist in studying the educational materials. While "きりはらの森" can be used as a standalone app for learning, it is most effective when used in conjunction with the physical textbooks. By utilizing Kirihara Shoten's educational materials and this app, users can achieve personalized study methods that suit their individual needs. There is no greater joy than when learners achieve their goals with the help of Kirihara Shoten's educational materials and "きりはらの森."