Summer Illusion of Steel
During a day at the beach, Kaname becomes upset at Sousuke's insensitivity. When she goes off alone, she is asked to have tea with a boy who is enamoured with her. Sousuke, however, believes that she was kidnapped and proceeds to rescue her from her apparent kidnappers.
Aired 02/09/2003EP 2 - Summer Illusion of Steel

Full Metal Panic? Fumoffu
It's back-to-school mayhem with Kaname Chidori and her war-freak classmate Sousuke Sagara as they encounter more misadventures in and out of Jindai High School. But when Kaname gets into some serious trouble, Sousuke takes the guise of Bonta-kun - the gun-wielding, butt-kicking mascot. And while he struggles to continue living as a normal teenager, Sousuke also has to deal with protecting his superior officer Teletha Testarossa, who has decided to take a vacation from Mithril and spend a couple of weeks as his and Kaname's classmate.
(Source: Anime News Network)