Renko Usami is a fictional character from ZUN's Music Collection, a series of music albums by ZUN, the creator of the Touhou Project. Renko is a university student who is deeply interested in the mysteries of the world and is part of the 'Sealing Club'. She has the unique ability to determine her precise location and the time by looking at the stars. Renko is a curious and adventurous individual, often exploring supernatural phenomena with her friend, Maribel Hearn. Her role involves uncovering secrets and connecting the real world with the fantastical elements of the Touhou universe.