Lelouch doesn't feel that he's good enough to be with C. C., so Natsuki and Shizuru let him know how lucky he truly is.
Lelouch and C. C. go on a double date with Natsuki and Shizuru. In order to have a good time, Lelouch will have to turn down his wacky behavior.
Natsuki and Shizuru make sure that Lelouch knows how lucky he truly is to have C. C. for a girlfriend.