Sustainable development (SD) means “development that meets the needs of the present generation without compromising the potential to meet the needs of future generations.” A mobile service that allows you to easily participate in environmental protection activities by sharing activities to observe fireflies, a representative environmental indicator species, through a mobile app as an activity for 'Goals 15: LIFE ON LAND (protection of terrestrial ecosystem)' among the indicators for sustainable development. no see. We also hope that observing fireflies with children will provide valuable experiences to the next generation.