Saku Sasaki is a virtual YouTuber and a member of the popular virtual talent agency, Nijisanji. Known for her upbeat and energetic personality, Saku engages her audience through a variety of content, including gaming streams, singing, and interactive chat sessions. She often features in collaborations with other virtual talents, showcasing her versatile skills and friendly nature. In the Nijisanji universe, Saku plays a pivotal role in bringing joy and entertainment to her fans, helping to expand the reach and popularity of virtual streaming worldwide.