Nisekoi
As a child, Raku Ichijo made a secret promise with his childhood sweetheart, keeping a pendant as a memento while his love took the key. He dreams of one day meeting his past love, but years later, reality smashes his hopes when Chitoge Kirisaki accidentally knees him in the face...
Though Raku's a normal high schooler, his family heads the notorious yakuza gang the Shuei-Gumi faction! And he's dragged into family affairs when he's forced into a relationship with Chitoge, the daughter of a rival gang's boss!
Despite their constant spats, the two somehow fool everyone with their false relationship. Raku then discovers that Chitoge has a mysterious key from her past, which she can't remember... Plus, two ...
Episode 1 - The Promise
Episode 2 - Encounter
Episode 3 - Two of a Kind
Episode 4 - The Visit
Episode 5 - Swimming
Episode 6 - Borrowing and Lending
Episode 7 - Rival
Episode 8 - Happiness
Episode 9 - Hot Springs
Episode 10 - Lottery
Episode 11 - Celebration
Episode 12 - Confirmation
Episode 13 - After School
Episode 14 - Ordeal
Episode 15 - Three Keys
Episode 16 - Typhoon
Episode 17 - Festival Day
Episode 18 - At the Beach
Episode 19 - The Play
Episode 20 - Showtime