Code Geass: Lelouch of the Rebellion

Suzaku transfers into Lelouch's class and faces the prejudice of the Britannian students. Arthur, a stray cat, enters Lelouch's room and steals his Zero mask. Milly Ashford, believing Arthur has something that embarrasses Lelouch, has the whole school pursue the cat with a bounty. When Suzaku catches up to the cat on the roof, Lelouch pretends to slip forcing Suzaku to save him. Lelouch secretly retrieves the mask and Suzaku's heroic save allows some of the students to accept him. The students attend an assembly where Charles zi Britannia, the emperor and Lelouch's father, delivers a speech during Prince Clovis' funeral. (Source: Wikipedia)