NISEKOI (KOMI NAOSHI) [Manga]

Awesome, thats the plot.

Ichijou Raku is an honor student with outstanding grades and an admirable conduct. Despite of being the only child of the Yakuza’s head, he’s dreaming of living an ordinary life. Many years ago, he made a pact with a girl named Onodera Kosaki that he carried the lock and she kept the key, and they would get married if they met each other again after years. When he enters high school, he has to date a girl named Kirisaki Chitoge in order to ease tensions between his and her families. However, at the same time, he’s reunited with Onodera. Ichijou’s high school life opposite to his expectations starts!