Love is a part of the Springtime of Youth / Love makes both sides Crazy

Rock Lee has a crush on Haruno Sakura. He mounts numerous "love offenses" on the target of his affections, but Sakura easily brushes them off. He recruits Tenten, hoping to show Sakura how cool he can be, but... Hoping to get closer to Sakura, Lee slips a love letter into her handbag without her knowing or catching him. Later, when he sees her happily carrying a love letter envelope from someone else, he becomes depressed! Naruto hatches a plan to cheer Lee up by stealing the other letter before Sakura can read it.