Setagaya Firefly Festival
It's not quite a Japanese summer without fireflies. Come see them at Setagaya's very own Firefly Festival which attracts a respectable 25,000 visitors every year. At the heart of the festival is the spectacle of approximately 3,000 fireflies released in a dome tent at the Setagaya Daikanyashiki parking lot. As dusk falls, watch these curious bugs illuminate the evening with their gentle glow.