NiziU created a social phenomenon with "Nizi Project" in 2020, and even during the COVID-19 pandemic, they delivered smiles and happiness to the world with their energy and presence full of "euphoria." Now in their 6th year of activities and still continuing to evolve, they release their first best album "Portfolio," which condenses their own journey. This work contains 20 tracks covering NiziU's signature songs, allowing listeners to trace the path of their growth. Comes with a 16-page lyrics booklet.