Based on the goal 9 of the moonshot R&D project, "Realization of a mentally healthy and dynamic society by increasing peace of mind and vitality by 2050," we will elucidate mental state transitions from the perspective of brain dynamics and its application based on the Eastern view of humanity, including Buddhism, and the findings of brain science. We will model the individuality of mental states through a combination of large-scale surveys and detailed surveys of small groups, develop technologies to estimate and visualize transitions in brain dynamics in real time, and develop and socially implement meditation methods backed by these technologies. Through these efforts, we aim to realize a society in which people can face themselves, increase their peace of mind and vitality, and have compassion for others.