En 9-årig amatöruppfinnare, smyckesdesigner, astrofysiker, tamburinspelare och pacifist, letar i New York efter ett lås som matchar en mystisk nyckel som lämnades kvar av hans far när han dödades i attackerna den 11 september.
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.
