Yuyu Shirai is one of the main characters in the anime series 'Assault Lily: Bouquet'. She is a talented and skilled 'Lily', a young girl trained to fight against mysterious creatures known as 'Huge' using powerful weapons called 'CHARM'. Yuyu is known for her calm and composed demeanor, which often hides a more troubled and emotional side due to her tragic past. She is a third-year student and serves as a mentor and protector to the protagonist, Riri Hitotsuyanagi, forming a close bond with her as the story progresses.