真っ先
Common
Noun
1
noun (common) (futsuumeishi)
the head;the foremost;beginning;the very front
あすの朝まっさきにそれを片付けます。
I'll do that first thing in the morning.
Other forms
まっ先 【まっさき】 · 真先 【まっさき】 (irregular okurigana usage)