Ruri tries to improve Kosaki's chances with Raku by having Raku and Chitoge teach Kosaki how to swim. Ruri notices that Raku and Chitoge argue more often than act lovey-dovey. Raku finds Kosaki's key and tries to use it unlock his pendant but it turns out to be the key to the girls locker room. The day of the swim meet, Kosaki uses a kick board, but when Chitoge gets hit by leg cramps and almost drowns, Raku rescues her and then has to give her mouth-to-mouth. Following the credits is a showcase of Raku and the gang's previous Valentine's Day experiences.