If you were looking for information on an actual Japanese instead, you might be thinking of:

A magic/harem series about a boy attending a magic school to save his cousin.

Gabriele Muccino (who also directed Will Smith in The Pursuit of Happyness ).

After causing a multi-car accident that killed seven people (including his wife), Tim assumes his brother's identity as an IRS agent to track down individuals he deems "worthy" of help. His goal is to donate his organs and assets to these seven people to "pay back" the lives he took.

Grief, sacrifice, redemption, and the weight of personal guilt.