To further elaborate on what I mean to avoid misunderstandings:

• In both series the protagonist duo is conformed on a girl who is one of the prettiest girls in high school and a boy who is very nerdy and pathetic in appearance.
• The Duo go often in crazy adventures.
• The Duo start out as friends but eventually form a relationship.
• The girl is proactive, strong and intelligent, the MVP in most of the cases.
• The boy is much more capable than meets the eye. Does anyone already made the comparison?