Chitoge reveals that she has a key that could unlock Raku's locket, but when they try, the key breaks. While Raku's locket is under repair, Raku thinks about who might be the one he made the promise to. Chitoge's father mentions that he recognized Kosaki from the past as the three were friends. Raku's father mentions he has a photo of the girl that Raku made a promise to ten years ago.