Nisekoi False Love GN Vol. 02: Zawsze in Love - Naoshi Komi

Raku and Chitoge's false love is off to a rocky start, but they have everyone fooled! Meanwhile, Raku's still hung up on his childhood sweetheart and wears a pendant around his neck as a memento. However, one big problem prevents him from finding the girl whom he promised to marry - he can't remember her name or face! To further complicate matters, Onodera, Raku's current crush who also harbors secret feelings for him, accidentally overhears Raku and Chitoge arguing over their false relationship!