Biwako Otsu Night Cruise Fireworks is a ticketed Lake Biwa event that combines an evening boat trip with a large-scale fireworks display synchronized to music. Launched in 2022, the event takes passengers from Otsu aboard several vessels toward a secret launch location on the lake, where the approximately 25-minute show unfolds over the water. Its program features fireworks sourced from across Japan and music focused on memorable film scores, creating an immersive experience distinct from a conventional land-based fireworks festival.

Organized by the Biwako Otsu Night Cruise Fireworks Executive Committee, the brand aims to nurture a new cultural and tourism attraction for Otsu while working with local partners. It offers a range of cruise plans on vessels including Michigan, Bianca, Shiki, and Ichibanmaru. Options vary from simple viewing cruises to packages with meals, buffet dining, soft drinks, reserved or premium deck seats, and a French-course dinner at Biwako Otsukan. Some plans also include special viewing arrangements, such as front-row seats or 360-degree views.