Deed
The leader of your branch became the leader from doing deeds. You can't rise to the rank of branch leader if you don't perform a certain number of deeds! Most of them good, I hope.
き, ぎ
わざ
None
The deed he's currently working on is finding your lost key (き). He doesn't have to help, you're the one who lost your own house-combination-car key. But he's so used to doing deeds, he can't help but help.