"OTONA NO YARUKIPEN" is an ultra-lightweight (8g) smart IoT learning device designed to help adults sustain their self-learning and certification preparation. Easily attached to any standard pen, its built-in sensor tracks writing movements to log study time. The data syncs with a dedicated smartphone app, visualizing learning efforts through clear graphs. Featuring gamification elements, avatar growth, and weekly personalized motivational reports tailored to behavioral trends, this smart stationery turns solitary study into an engaging experience, effectively transforming inconsistent habits into sustainable learning success.