Nisekoi: False Love, Vol. 05

Meanwhile, Raku's still hung up over the girl he made a promise with ten years ago, keeping a pendant around his neck as a memento. The girl, in turn, holds the key that opens the pendant. To Raku's surprise, he discovers three girls have keys from a promise they also made ten years ago—Chitoge, his current crush Onodera, and the police chief's daughter Marika!