Local governments in Japan were struggling to communicate effectively with citizens using traditional methods like paper announcements and websites. To address this, governments have increasingly used the popular LINE messaging app to disseminate information to citizens. Sumiyoku is a cloud-based LINE service specifically designed for governments to improve communication and services for citizens. It offers key functions for tasks like disaster alerts, surveys, appointments and payments in an affordable and easy-to-use package. Several local governments in Japan have implemented Sumiyoku successfully. The developers plan to expand its capabilities and use across different messaging platforms.