As night falls, leave the crowds behind and join a small-group adventure to witness one of Japan's rarest natural experiences. Along a quiet shoreline in the Seto Inland Sea, you'll discover tiny bioluminescent sea fireflies and glowing blue plankton that illuminate the water after dark. Your guide will introduce the fascinating science and history behind these remarkable creatures before showing you how to safely collect sea fireflies using simple, environmentally responsible methods. You'll have the rare opportunity to observe their brilliant electric-blue glow up close before they are carefully returned to their natural habitat. Throughout the evening you'll also search for glowing plankton, creating breathtaking flashes of blue light in the sea. Along the way you'll learn about the local marine ecosystem, conservation efforts, and the unique conditions that make this phenomenon possible. This intimate, hands-on experience combines nature, science, and wonder, offering an unforgettable night that few travellers to Japan ever have the chance to experience.