Kin no Kanojo, Gin no Kanojo

The romantic comedy depicts a hapless protagonist and his beautiful love interest — The plot starts when the girl he likes fell in to a lake and then appears the "Lady Of The Lake", who ask, did you lose your golden girlfriend or your silver girlfriend. This leads the original to be split into two girls.
The "Golden Girlfriend" is the graceful and ladylike type, while the "Silver Girlfriend" is the mischievous, foulmouthed, and straightforward type.