From The Director Of Madoka Magica Comes The Breakout Anime of 2014!

Raku Ichijo is an average high school student. He also happens to be the sole heir to the head of a Yakuza Family called the Shuei-gumi. 10 years ago, Raku made a promise... a secret promise with a girl he met. They promised one another that they will "get married when they reunite." Since then, Raku never let go of the pendant the girl gave him."